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<BODY text=3D#000000 bgColor=3Dwhite><FONT color=3D#000000><!--Malignant =
Lymphoma, emedicine free online medical reference textbooks for doctors, =
medical professionals and consumers --><!--Malignant Lymphoma - Primary =
lymphoma of bone is an uncommon disease and must be separated from =
skeletal involvement in systemic lymphoma. The former is stage IE =
(extranodal, see Staging) disease and may present to the orthopedic =
surgeon prior to biopsy as a solitary bone lesion simulating a bone =
sarcoma. The latter, by definition, is stage IV disease and usually is =
not seen initially by the orthopedic surgeon except for treatment of =
complications such as pathologic ...--><!--malignant =
lymphoma,osteolymphoma,reticulum cell sarcoma,primary lymphoma of =
bone,bone cancer,paget disease,bone lymphoma,bone pain,-->
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          <TD width=3D"70%">
            <H2>Malignant Lymphoma</H2><FONT size=3D2><B>Last =
Updated:</B> May 13,=20
            2002 </FONT></TD>
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          <TD class=3D13pxarial colSpan=3D2><B>Synonyms and related =
keywords:</B>=20
            osteolymphoma, reticulum cell sarcoma, primary lymphoma of =
bone,=20
            bone cancer, Paget disease, bone lymphoma, bone=20
      pain</TD></TR></TBODY></TABLE>
      <P><A name=3Dsection~author_information>
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          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>AUTHOR INFORMATION=20
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 1 of =
11&nbsp;&nbsp;&nbsp;</B></FONT>=20
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LE>
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          <TD>Author: <A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/screen@d:/em/ga?book=3D=
orthoped&amp;authorid=3D7653&amp;topicid=3D514"><STRONG>Sharad=20
            Mathur, MD</STRONG></A>, Staff Physician, Department of =
Pathology,=20
            Kansas City VA Medical Center
            <P>Coauthor(s): <A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/screen@d:/em/ga?book=3D=
orthoped&amp;authorid=3D7653&amp;topicid=3D514"><STRONG>Timothy=20
            Damron, MD</STRONG></A>, Associate Professor, Department of=20
            Orthopedics, Division of Orthopedic Oncology - Joint =
Reconstructive=20
            Surgery, State University of New York at Syracuse, Upstate =
Medical=20
            University
            <P></P></TD></TR>
        <TR>
          <TD>Sharad Mathur, MD, is a member of the following medical=20
            societies: <A=20
            href=3D"http://depts.washington.edu/labweb/aclps/">Academy =
of Clinical=20
            Laboratory Physicians and Scientists</A>, <A=20
            href=3D"http://www.ascp.org/">American Society of Clinical=20
            Pathologists</A>, <A =
href=3D"http://www.cytopathology.org/">American=20
            Society of Cytopathology</A>, <A=20
            href=3D"http://www.hematology.org/">American Society of=20
            Hematology</A>, <A href=3D"http://www.cap.org/">College of =
American=20
            Pathologists</A>, and <A =
href=3D"http://www.uscap.org/">United States=20
            and Canadian Academy of Pathology</A>
            <P></P></TD></TR>
        <TR>
          <TD>Editor(s): <STRONG>Lynn A Crosby, MD, FACS</STRONG>, Chief =
of=20
            Shoulder Division, Professor, Department of Orthopedic =
Surgery,=20
            Wright State University School of Medicine; =
<STRONG>Francisco=20
            Talavera, PharmD, PhD</STRONG>, Senior Pharmacy Editor, =
Pharmacy,=20
            eMedicine; <STRONG>Sean P Scully, MD, PhD</STRONG>, Senior =
Associate=20
            Consultant, Department of Orthopedics, Mayo Clinic of =
Rochester;=20
            <STRONG>Dinesh Patel, MD</STRONG>, Assistant Clinical =
Professor of=20
            Orthopedic Surgery, Harvard Medical School; Chief of =
Arthroscopic=20
            Surgery, Department of Orthopedic Surgery, Massachusetts =
General=20
            Hospital; and <STRONG>Harris Gellman, MD</STRONG>, Clinical=20
            Professor of Orthopedic Surgery, University of Arkansas and=20
            University of Miami; Consulting Surgeon, Broward Hand Center =

        </TD></TR></TBODY></TABLE><A name=3Dsection~introduction>
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          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>INTRODUCTION =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 2 of =
11&nbsp;&nbsp;&nbsp;</B></FONT><A=20
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href=3D"http://www.emedicine.com/orthoped/topic514.htm#section~author_inf=
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LE>
      <P><!--Body:section~introduction-->Primary lymphoma of bone is an =
uncommon=20
      disease and must be separated from skeletal involvement in =
systemic=20
      lymphoma. The former is stage IE (extranodal, see <A=20
      =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#targetA">Staging</=
A>)=20
      disease and may present to the orthopedic surgeon prior to biopsy =
as a=20
      solitary bone lesion simulating a bone sarcoma. The latter, by =
definition,=20
      is stage IV disease and usually is not seen initially by the =
orthopedic=20
      surgeon except for treatment of complications such as pathologic =
fracture.
      <P><STRONG>History of the Procedure: </STRONG>Oberling first =
suggested the=20
      diagnosis of reticulum cell sarcoma in 1928. Parker and Jackson =
separated=20
      it from Ewing sarcoma in 1939.
      <P><STRONG>Problem: </STRONG>The definition of primary lymphoma of =
bone=20
      continues to be debated. Most authors exclude disseminated or =
recurrent=20
      disease in which the bone is only one of many sites of =
involvement. To be=20
      considered primary lymphoma of bone, the following criteria should =
be met:=20

      <P>
      <UL>
        <LI>Histologic documentation of lymphoma in the bone=20
        <P></P>
        <LI>Solitary bone lesion or multiple skeletal lesions with no =
prior=20
        involvement of lymph nodes or other lymphoid tissue=20
        <P></P>
        <LI>No lymph node involvement or involvement of regional lymph =
nodes=20
        only</LI></UL>
      <P>Soft tissue extension from the bone lesion is acceptable, and =
the=20
      involved soft tissue may be sampled to document malignant =
lymphoma.
      <P>
      <P><STRONG>Frequency: </STRONG>Primary lymphoma of bone =
constitutes 3% of=20
      primary bone tumors and 5% of extranodal lymphomas (or =
approximately 2% of=20
      all primary non-Hodgkin lymphomas). Secondary involvement of the =
bone=20
      marrow in lymphoma is seen in 5-15% of patients with Hodgkin =
disease and=20
      30-53% of patients with non-Hodgkin lymphoma. Up to 50% of =
patients with=20
      AIDS-associated Hodgkin disease have secondary bone marrow =
involvement.=20
      <P>Males are affected more frequently than are females =
(male-to-female=20
      ratio of 1.8:1). All ages are affected, although lymphoma of bone =
is=20
      uncommon in childhood. Most patients are in the fifth to seventh =
decades=20
      of life.=20
      <P>Involved bones are those that normally contain red marrow. =
Common sites=20
      in decreasing frequency include the femur, humerus, tibia, spine, =
pelvis,=20
      sternum, ribs, and bones of the skull and face. Involvement of =
small bones=20
      of the hands and feet is rare. Some series suggest the mandible =
and=20
      maxilla as the most frequently affected sites, but in these =
series,=20
      documentation of bone as the primary site of disease is not well=20
supported.
      <P><STRONG>Etiology: </STRONG>The etiology of bone lymphoma is =
unknown.=20
      Viral agents and immunosuppression are implicated in some cases. =
Primary=20
      lymphoma of bone has been documented as a posttransplant=20
      lymphoproliferative disorder in patients who were =
immunosuppressed. Bone=20
      has also been documented as a site for primary lymphoma in =
patients with=20
      AIDS. Rarely, patients with Paget disease of bone may develop =
malignant=20
      lymphoma in the involved bone. However, these associations are not =

      commonly documented and are the subject of a few case reports in =
the=20
      literature.
      <P>
      <P><STRONG>Pathophysiology: </STRONG>Cytogenetic and molecular=20
      abnormalities are involved in the pathophysiology of many =
different=20
      lymphomas. These can be documented in the setting of primary bone =
lymphoma=20
      as well.=20
      <P>Some common recurrent abnormalities are as follows:=20
      <P>
      <UL>
        <LI>t(14;18)(q32;q21) - Overexpression of Bcl-2 protein, seen in =
80-90%=20
        of follicular B-cell lymphomas and 20% of diffuse large B-cell =
lymphomas=20

        <P></P>
        <LI>Rearrangements involving band 3q27 - Rearrangement of =
<EM>BCL6</EM>=20
        gene, seen in 35% of diffuse large B-cell lymphomas=20
        <P></P>
        <LI>t(8:14)(q24;q32) - Overexpression of Myc protein, seen in =
80% of=20
        Burkitt lymphomas; variant translocations t(2;8)(p11;q24) or=20
        t(8;22)(q24;q11) in remaining 20% of cases=20
        <P></P>
        <LI>t(2;5)(p23;q35) - Formation of nucleophosmin-anaplastic =
lymphoma=20
        kinase (NPM-ALK) fusion protein, seen in T-cell anaplastic large =
cell=20
        lymphoma=20
        <P></P>
        <LI>t(11;14)(q13;q32) - Overexpression of cyclin D1, seen in =
mantle cell=20
        lymphoma (not reported as a primary bone lymphoma)</LI></UL>
      <P><STRONG>Clinical: </STRONG>The most common presenting feature =
of bone=20
      lymphoma is bone pain, which occurs in 60-100% of patients. Other=20
      presenting features are palpable swelling or mass and pathologic =
fracture.=20
      Pediatric patients may present with functional deficits in =
involved limbs.=20
      Systemic symptoms (B-symptoms), such as weight loss, fever, and =
night=20
      sweats, are seen in fewer than 10% of patients in true stage IE =
lymphoma=20
      of bone. Regional lymph nodes may be involved in some patients, =
although=20
      as previously mentioned, this occurs more commonly in cases of =
bone=20
      involvement in patients with systemic lymphoma. Hypercalcemia is =
seen in=20
      some pediatric patients and has been associated with a poorer =
prognosis.=20
      As mentioned above, primary lymphoma of bone has rarely been =
associated=20
      with AIDS, immunosuppression, and Paget disease of bone.<A=20
      name=3Dsection~indications>
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          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>INDICATIONS =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 3 of =
11&nbsp;&nbsp;&nbsp;</B></FONT><A=20
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LE>
      <P><!--Body:section~indications-->Indications for operative =
involvement by=20
      orthopedic surgeons in bone lymphoma most commonly fall into 1 of =
3=20
      categories: (1) diagnosis, (2) treatment of pathologic or =
impending=20
      pathologic fractures, and (3) decompression of spinal canal =
compromise. At=20
      this time, no clear role for surgical debulking procedures or =
resection=20
      exists for primary bone lymphoma.=20
      <P><B>Indications for diagnostic procedures</B>=20
      <P>Diagnostic procedures are indicated most frequently in the =
presence of=20
      a solitary bone lesion with a differential diagnosis including =
lymphoma=20
      and metastatic disease, myeloma, and/or primary bone sarcoma. In =
most=20
      instances, a needle biopsy is adequate to diagnosis lymphoma of =
bone, but=20
      specific subtyping may necessitate open biopsy when inadequate =
tissue is=20
      present from the fine needle procedure. Close communication =
between the=20
      orthopedic surgeon and pathologist is crucial to ensure that the =
fresh=20
      tissue is processed in such a fashion that all needed information =
is=20
      obtained. In most instances, this requires following a lymphoma =
protocol,=20
      which includes obtaining fresh tissue for immunophenotyping, =
cytogenetic,=20
      and molecular studies (see <A=20
      =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#targetB">Diagnosti=
c=20
      Procedures</A>).=20
      <P>Whenever soft tissue extension from the bone lesion is apparent =
on=20
      prebiopsy imaging studies, a biopsy should be taken of the soft =
tissue=20
      extent in order to avoid further weakening of the bone that could =
lead to=20
      pathologic fracture. Similarly, in disseminated disease with bone=20
      involvement, such as when there is concurrent lymphadenopathy, the =
lymph=20
      nodes usually are the most accessible and, therefore, most =
desirable site=20
      for biopsy. In these latter instances, bone biopsy usually can be =
avoided=20
      if the radiologic features are consistent with the disseminated =
disease.=20
      <P><B>Indications for prophylactic stabilization of impending =
pathologic=20
      fractures</B>=20
      <P>Because lymphomas involving bone may result in pathologic =
fracture,=20
      take appropriate steps to prevent pathologic fracture before it =
occurs. In=20
      most instances, particularly in patients who are younger and =
compliant,=20
      protective weightbearing through the time of treatment and until=20
      radiologic appearance improves will suffice. However, in selected =
patients=20
      who are either unable or unwilling to take such measures to avoid =
fracture=20
      during this often-protracted period, prophylactic stabilization =
may be=20
      indicated.=20
      <P>Essentially, the evaluation for impending pathologic fracture =
is the=20
      same for bone lymphoma as it is for metastatic bone lesions. The =
highest=20
      risk lesions are those of a lytic nature involving more than one =
half to=20
      two thirds the diameter of the involved bone, particularly when =
located in=20
      the peritrochanteric region, or to a lesser extent, elsewhere in =
the lower=20
      extremity, and when accompanied by functional weightbearing pain. =
Whenever=20
      prophylactic stabilization is considered prior to potential =
radiotherapy=20
      treatment, however, close communication with the radiation =
oncologist is=20
      important to ensure that the implant will not hamper the planned =
treatment=20
      course to a great degree.=20
      <P><B>Indications for fixation of pathologic fractures and =
excision</B>=20
      <P>Once pathologic fracture occurs through bone involved by =
lymphoma,=20
      operative stabilization is generally indicated, particularly in =
the lower=20
      extremities, long bones of the upper extremities, and unstable =
spine=20
      fractures. When internal fixation is needed at the time of =
diagnosis or=20
      prior to irradiation, close communication with the radiation =
oncologists=20
      is needed to determine how the internal fixation will affect =
radiotherapy=20
      treatment options. However, in most cases, if the radiation =
employs=20
      anteroposterior and posteroanterior fields, the scatter created by =
the=20
      internal fixation in each direction will cancel out and not create =
a great=20
      problem.=20
      <P>Age, health status, and willingness to comply with protected=20
      weightbearing are important considerations in the setting of an =
apparent=20
      impending pathologic fracture due to bone involvement by lymphoma, =
as=20
      generally the initially lytic changes on radiograph will fill in =
over time=20
      following radiotherapy. If the patient is willing and able to use=20
      ambulatory aids to limit weightbearing for lower extremity =
lesions,=20
      avoiding internal fixation is sometimes desirable. In rare cases =
with=20
      recalcitrant symptomatic local disease, limited extremity =
function, or=20
      nonunion of pathologic fracture through irradiated bone previously =

      involved by lymphoma, excision of the involved bone may be =
considered.=20
      <P><B>Decompression of spinal canal compromise</B>=20
      <P>Occasionally, lymphoma involves the spine. In these cases, =
tumor may=20
      extend from the bone into the spinal canal. When this soft tissue=20
      extension results in progressive neurological deficit, =
decompression may=20
      be necessary. The need for concomitant fusion is determined in =
large part=20
      by the extent of instability created by the decompressive =
procedure.
      <P><A name=3Dsection~relevant_anatomy_and_contraindications>
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          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>RELEVANT ANATOMY AND =

            CONTRAINDICATIONS </B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 4 of =
11&nbsp;&nbsp;&nbsp;</B></FONT><A=20
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LE>
      =
<P><!--Body:section~relevant_anatomy_and_contraindications--><STRONG>Cont=
raindications:=20
      </STRONG>Operative excision rarely is indicated in the primary =
treatment=20
      of bone lymphoma. Increasing evidence suggests that the prognosis =
for even=20
      isolated stage IE bone lymphoma may not be significantly better =
than that=20
      for disseminated lymphoma with bone involvement, further =
underscoring the=20
      importance of systemic management for local disease treatment.=20
      <P>Because surgical intervention is used only for establishing a =
diagnosis=20
      (biopsy) and for managing complications, no specific =
contraindications to=20
      surgery exist.
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      <P><!--Body:section~workup-->
      <P><STRONG>Lab Studies: </STRONG><BR>
      <UL>
        <LI>Basic hematology: Obtain a CBC with differential WBC count =
to=20
        evaluate peripheral blood for evidence of leukemia, as leukemic =
deposits=20
        may mimic primary lymphoma of bone.</LI></UL>
      <UL>
        <LI>Routine serum chemistry</LI></UL>
      <UL>
        <UL>
          <LI>Serum chemistry studies including calcium level may reveal =

          hypercalcemia in some patients.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Most patients have elevated lactate dehydrogenase (LDH) =
levels,=20
          although this is directly proportionate to the disease load. =
In=20
          patients with truly isolated stage IE bone disease involving =
smaller=20
          bones, the LDH may be within normal limits.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Erythrocyte sedimentation rate (ESR) also is frequently =
elevated=20
          in systemic disease involvement.</LI></UL></UL>
      <P><STRONG>Imaging Studies: </STRONG><BR>
      <UL>
        <LI>Plain radiography and CT scanning</LI></UL>
      <UL>
        <UL>
          <LI>These studies depict lytic lesions in most cases, with a=20
          moth-eaten or permeative pattern of bone =
destruction.</LI></UL></UL>
      <UL>
        <UL>
          <LI>A mixed lytic-sclerotic reaction is evident in =
approximately 30%=20
          of cases, and fewer than 5% of lesions are purely sclerotic. =
Sclerotic=20
          lesions are uncommon in primary non-Hodgkin lymphoma of bone =
but are=20
          seen relatively more frequently in disseminated Hodgkin=20
        disease.</LI></UL></UL>
      <UL>
        <UL>
          <LI>An associated soft tissue mass extending from the bone =
involved is=20
          apparent in 50-85% of cases.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Periosteal reaction is less common, but it may lead to =
confusion=20
          with other aggressive lesions when present.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Lymphomas of bone often are large and may involve the =
entire bone.=20
          Lymphomas may involve the entire end of a bone, including the=20
          adjoining metaphysis and epiphysis down to the subchondral =
bone, an=20
          appearance that may be confused with Paget disease or a benign =
giant=20
          cell tumor of bone.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Sequestra are apparent in up to 11% of cases. These are =
unusual in=20
          malignant bone tumors other than fibrosarcoma and similar=20
        tumors.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Differential diagnoses include metastatic carcinoma, =
osteosarcoma,=20
          Ewing sarcoma, malignant fibrous histiocytoma or fibrosarcoma =
of bone,=20
          neuroblastoma and other small round cell tumors, =
osteomyelitis,=20
          Langerhans cell histiocytosis, multiple myeloma, leukemic =
infiltrate,=20
          Paget disease, and giant cell tumor, depending upon the exact=20
          radiographic appearance and the age of the =
patient.</LI></UL></UL>
      <UL>
        <LI>MRI</LI></UL>
      <UL>
        <UL>
          <LI>Most lesions appear homogeneous and hypointense on =
T1-weighted=20
          images and enhance with the administration of =
contrast.</LI></UL></UL>
      <UL>
        <UL>
          <LI>The appearance on T2-weighted images is inhomogeneous and =
may be=20
          hypointense, isointense, or hyperintense with respect to=20
      fat.</LI></UL></UL>
      <UL>
        <UL>
          <LI>MRI has high sensitivity for detecting lesions and for=20
          demonstrating soft tissue extension. Extension across a joint =
rarely=20
          is seen.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Primary lymphoma of bone can be suspected based on MRI if =
an=20
          intact cortex is seen, even in the face of soft tissue =
extension,=20
          although this finding is by no means specific to =
lymphoma.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Hypointense lesions on T2-weighted images correlated with=20
          histologic evidence of intralesional fibrosis in one study. =
Lesions of=20
          osteosarcoma, Ewing sarcoma, multiple myeloma, neuroblastoma, =
and=20
          other small round cell tumors always are hyperintense on =
T2-weighted=20
          images and typically have destructive cortical penetration if =
soft=20
          tissue extension is present.</LI></UL></UL>
      <UL>
        <LI>Technetium bone scan</LI></UL>
      <UL>
        <UL>
          <LI>Increased uptake usually is noted, particularly at the =
periphery=20
          of the lesions, although a central cold area may be present,=20
          representing necrotic tumor.</LI></UL></UL>
      <UL>
        <UL>
          <LI>This technique has very good sensitivity, with increased =
uptake=20
          noted in 98% of patients.</LI></UL></UL>
      <UL>
        <LI>Gallium scan</LI></UL>
      <UL>
        <UL>
          <LI>Increased uptake is noted most commonly throughout the =
lesions,=20
          and the scan frequently is used for both initial staging and=20
          follow-up.</LI></UL></UL>
      <UL>
        <UL>
          <LI>This technique has comparable sensitivity to a technetium =
scan and=20
          can reveal soft tissue lesions as well.</LI></UL></UL>
      <P><STRONG>Other Tests: </STRONG><BR>
      <UL>
        <LI>Flow cytometry studies</LI></UL>
      <UL>
        <UL>
          <LI>This technique uses fresh tissue to document cell surface =
markers=20
          that identify cell lineage.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Identification of the immunophenotype of malignant =
lymphoma is=20
          essential for proper diagnosis, classification, and=20
      treatment.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Submit tissue to the laboratory fresh or in a tissue =
culture=20
          medium such as RPMI1640.</LI></UL></UL>
      <UL>
        <LI>Cytogenetic studies</LI></UL>
      <UL>
        <UL>
          <LI>Cytogenetic abnormalities are common in lymphomas and have =

          diagnostic, therapeutic, and prognostic =
significance.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Submit tissue specimens for cytogenetic studies to the =
laboratory=20
          fresh or in tissue culture medium such as RPMI1640 or Ham's=20
        F-10.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Bone marrow aspirate and peripheral blood specimens =
collected with=20
          sodium heparin anticoagulant also may be submitted for =
cytogenetic=20
          analysis.</LI></UL></UL>
      <UL>
        <LI>Molecular pathology studies</LI></UL>
      <UL>
        <UL>
          <LI>For molecular studies, fresh tissue should be frozen and =
kept at=20
          -70 degrees Celsius.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Paraffin-embedded tissue from histopathology also is =
acceptable=20
          for some molecular tests.</LI></UL></UL>
      <UL>
        <UL>
          <LI>Bone marrow aspirate and peripheral blood specimens =
collected with=20
          ethylenediaminetetraacetic acid (EDTA) anticoagulant also may =
be=20
          submitted for molecular pathology studies.<A =
name=3DtargetB></LI></UL></UL>
      <P><STRONG>Diagnostic Procedures: </STRONG><BR>
      <UL>
        <LI>Tissue must be obtained from the involved bone or associated =
soft=20
        tissue mass to document malignant lymphoma in order to diagnose =
primary=20
        lymphoma of bone. The possibility of a nonlymphoid primary bone =
tumor=20
        cannot be excluded until the biopsy is evaluated. It is =
important that=20
        the biopsy be performed in a manner that allows for excision of =
the=20
        biopsy tract with a subsequent en bloc resection, if necessary.=20
        Therefore, such biopsies are best performed by surgeons trained =
in=20
        oncologic resection. Diagnostic procedures that can be employed =
are the=20
        following:</LI></UL>
      <UL>
        <UL>
          <LI>Fine-needle aspiration</LI></UL></UL>
      <UL>
        <UL>
          <LI>Core needle biopsy</LI></UL></UL>
      <UL>
        <UL>
          <LI>Open biopsy</LI></UL></UL>
      <UL>
        <LI>Obtaining sufficient tissue for ancillary studies to avoid =
repeat=20
        procedures is imperative. Consultation with the pathologist =
and/or=20
        laboratory personnel before performing a diagnostic procedure is =

        essential if lymphoma is being considered as a differential =
diagnosis of=20
        a bone lesion. This communication should continue at the time of =
biopsy.=20
        Request frozen section confirmation of tissue viability and =
adequacy. In=20
        many centers, it is possible to submit fresh tissue to the =
pathologist,=20
        who then distributes it to various sections for ancillary =
studies as=20
        deemed appropriate. The pathologist also may perform =
intraoperative=20
        studies to determine the adequacy of the specimen. If these =
guidelines=20
        are not followed, 50% of patients or more require additional =
procedures=20
        for diagnosis before treatment is initiated. The proper =
diagnosis,=20
        classification, and management of malignant lymphomas involve =
the=20
        following:</LI></UL>
      <UL>
        <UL>
          <LI>Histopathology</LI></UL></UL>
      <UL>
        <UL>
          <LI>Immunohistochemistry</LI></UL></UL>
      <UL>
        <UL>
          <LI>Immunophenotyping (flow cytometry) studies</LI></UL></UL>
      <UL>
        <UL>
          <LI>Cytogenetic studies</LI></UL></UL>
      <UL>
        <UL>
          <LI>Molecular pathology =
studies</LI></UL></UL><STRONG>Histologic Findings:=20
      </STRONG>Malignant lymphomas are classified based on the Revised =
European=20
      American Lymphoma (REAL) classification or on the proposed World =
Health=20
      Organization (WHO) classification, both of which are similar and =
are based=20
      on immunophenotype and morphology.=20
      <P>In adults, the most common subtype seen as primary lymphoma of =
bone is=20
      diffuse large B-cell lymphoma, which accounts for 60-90% of cases. =
These=20
      cases show a diffuse population of large lymphoid cells, sometimes =
with=20
      convoluted nuclear contours. Admixed fibrosis is present with a =
background=20
      population of reactive small lymphocytes.=20
      <P>Other types of lymphoma seen in primary bone lesions include =
follicular=20
      lymphoma, Burkitt lymphoma, precursor B-lymphoblastic lymphoma, =
and B-cell=20
      small lymphocytic lymphoma. T-cell lymphomas are distinctly =
uncommon.=20
      Cases of anaplastic large cell lymphoma, peripheral T-cell =
lymphoma, and=20
      adult T-cell lymphoma have been reported, the latter associated =
with human=20
      T-cell lymphotrophic virus type I (HTLV-I) infection.=20
      <P>Histologic differential diagnoses include Ewing sarcoma, =
neuroblastoma=20
      and other small round cell tumors, granulocytic sarcoma, and =
Langerhans=20
      cell histiocytosis. <BR><BR><STRONG>Staging: </STRONG><A =
name=3DtargetA>
      <UL>
        <LI>Most primary lymphomas of bone are considered stage IE or =
IIE in the=20
        Ann Arbor staging system. This system is suboptimal for staging =
primary=20
        bone lymphoma and is applied inconsistently in the published =
literature.=20
        A modification of the Ann Arbor system has been proposed, as=20
        follows:</LI></UL>
      <UL>
        <UL>
          <LI>Stage I - One bony lesion with or without soft tissue=20
          extension</LI></UL></UL>
      <UL>
        <UL>
          <LI>Stage II - Two bony lesions on the same side of the =
diaphragm or 1=20
          bony lesion with regional lymph node =
involvement</LI></UL></UL>
      <UL>
        <UL>
          <LI>Stage III - Involvement on both sides of the =
diaphragm</LI></UL></UL>
      <UL>
        <UL>
          <LI>Stage IV - Involvement of the central or peripheral =
nervous system=20
          or bone marrow on staging biopsy</LI></UL></UL>
      <UL>
        <LI>In addition to imaging of the primary lesion (with plain=20
        radiographs, CT scan, or MRI) and physical examination, staging =
studies=20
        include CT scans of the chest, abdomen, and pelvis; technetium =
bone=20
        scan; and bilateral iliac crest bone marrow biopsy. In children, =

        examination of cerebrospinal fluid also is recommended to =
exclude=20
        central nervous system (CNS) involvement.</LI></UL><A=20
      name=3Dsection~treatment>
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          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>TREATMENT =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 6 of =
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                  And Prognosis</A> <A=20
                  title=3D"Click here to view the Future And =
Controversies section of this topic "=20
                  =
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                  And Controversies</A> <A=20
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LE>
      <P><!--Body:section~treatment--><STRONG>Medical therapy: =
</STRONG>The=20
      mainstay therapy for primary lymphoma of bone is medical. =
Chemotherapy and=20
      radiation therapy are used in conjunction in most cases.=20
      <P>The usual chemotherapy is CHOP (cyclophosphamide, Adriamycin,=20
      vincristine, prednisone) or other similar regimens for several =
cycles.=20
      This may be combined with radiation therapy to the affected bone =
in the=20
      dose of 40-60 Gy fractionated over several weeks. Some studies =
indicate=20
      that results of combined modality therapy (chemotherapy and =
radiation=20
      therapy) are better than those from radiation therapy alone, while =
other=20
      studies have not documented any statistically significant =
difference. Due=20
      to the relative rarity of this disease, standard treatment =
protocols have=20
      not been developed and followed, and the data in the literature =
are=20
      retrospective.=20
      <P>In children, aggressive chemotherapy alone appears to be as =
effective=20
      as combined modality therapy. Because radiation therapy in =
children is=20
      associated with an increased incidence of growth-related adverse=20
      consequences, it should be avoided in this population.=20
      <P>Therapeutic agents such as anti-CD20 antibody (rituximab) have =
been=20
      used for B-cell lymphomas. Refractory cases have been treated with =

      allogeneic bone marrow transplantation.
      <P><STRONG>Surgical therapy: </STRONG>No standard role for =
surgical=20
      therapy exists in the primary management of bone lymphomas beyond=20
      obtaining tissue for diagnosis and treatment of complications such =
as=20
      pathologic fracture. Before the advent of radiation and =
chemotherapy, some=20
      patients were treated with amputations, but amputations generally =
are not=20
      necessary with the medical treatment available today.
      <P><A name=3Dsection~complications>
      <TABLE borderColor=3D#333399 cellSpacing=3D0 cellPadding=3D4 =
width=3D"99%"=20
      border=3D1>
        <TBODY>
        <TR bgColor=3D#333399>
          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>COMPLICATIONS =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 7 of =
11&nbsp;&nbsp;&nbsp;</B></FONT><A=20
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href=3D"http://www.emedicine.com/orthoped/topic514.htm#section~treatment"=
><IMG=20
            height=3D10=20
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topic"=20
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            align=3Dmiddle border=3D0></A> <A class=3Dtopnav=20
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            title=3D"Click here to go to the top of this page" =
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align=3Dmiddle=20
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              <TBODY>
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of this topic "=20
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                  <A=20
                  title=3D"Click here to view the Relevant Anatomy And =
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                  Anatomy And Contraindications</A> <A=20
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                  title=3D"Click here to view the Treatment section of =
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>Treatment</A>=20
                  <A=20
                  title=3D"Click here to view the Complications section =
of this topic "=20
                  =
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ons">Complications</A>=20
                  <A=20
                  title=3D"Click here to view the Outcome And Prognosis =
section of this topic "=20
                  =
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d_prognosis">Outcome=20
                  And Prognosis</A> <A=20
                  title=3D"Click here to view the Future And =
Controversies section of this topic "=20
                  =
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_controversies">Future=20
                  And Controversies</A> <A=20
                  title=3D"Click here to view the Pictures section of =
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LE>
      <P><!--Body:section~complications-->Complications of treatment =
include the=20
      following:=20
      <P>
      <UL>
        <LI>Fracture=20
        <P></P>
        <LI>Fracture nonunion=20
        <P></P>
        <LI>Wound infection=20
        <P></P>
        <LI>Osteonecrosis=20
        <P></P>
        <LI>Secondary arthritis following collapse of osteonecrotic bone =

        <P></P>
        <LI>Neuropathy=20
        <P></P>
        <LI>Toxicity of chemotherapy=20
        <P></P>
        <LI>Thrombophlebitis </LI></UL>
      <P>Fractures are most common in weightbearing bones and have been=20
      associated with the primary disease, with radiation therapy, and =
with=20
      avascular necrosis following chemotherapy.
      <P><A name=3Dsection~outcome_and_prognosis>
      <TABLE borderColor=3D#333399 cellSpacing=3D0 cellPadding=3D4 =
width=3D"99%"=20
      border=3D1>
        <TBODY>
        <TR bgColor=3D#333399>
          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>OUTCOME AND =
PROGNOSIS=20
          </B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 8 of =
11&nbsp;&nbsp;&nbsp;</B></FONT><A=20
            =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#section~complicati=
ons"><IMG=20
            height=3D10=20
            alt=3D"Click here to go to the previous section in this =
topic"=20
            src=3D"http://www.emedicine.com/images/back3.gif" width=3D31 =

            align=3Dmiddle border=3D0></A> <A class=3Dtopnav=20
            =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#"><IMG=20
            title=3D"Click here to go to the top of this page" =
height=3D10=20
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align=3Dmiddle=20
            border=3D0></A> <A=20
            =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#section~future_and=
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                  Anatomy And Contraindications</A> <A=20
                  title=3D"Click here to view the Workup section of this =
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>Treatment</A>=20
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                  title=3D"Click here to view the Complications section =
of this topic "=20
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ons">Complications</A>=20
                  <A=20
                  title=3D"Click here to view the Outcome And Prognosis =
section of this topic "=20
                  =
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d_prognosis">Outcome=20
                  And Prognosis</A> <A=20
                  title=3D"Click here to view the Future And =
Controversies section of this topic "=20
                  =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#section~future_and=
_controversies">Future=20
                  And Controversies</A> <A=20
                  title=3D"Click here to view the Pictures section of =
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LE>
      <P><!--Body:section~outcome_and_prognosis-->Compared to other =
malignant=20
      tumors of bone, primary lymphoma of bone has a good prognosis =
overall.=20
      With effective chemotherapy and radiation therapy, most series =
site an=20
      overall 5-year survival of 60% or higher. In the pediatric =
population,=20
      aggressive chemotherapy has led to 5-year survival rates higher =
than 90%.=20
      One recent study found no statistically significant difference in =
survival=20
      between primary lymphoma of bone (stage IE) and nodal lymphoma =
with bone=20
      metastasis (stage IV). This may reflect the overall improvement in =

      survival statistics for non-Hodgkin lymphoma.=20
      <P>Most patients that relapse do so early. Local recurrence and =
distant=20
      spread both are observed. Radiation therapy helps to decrease the=20
      incidence of local recurrence. Therefore, recent series in the =
literature=20
      portray a relatively higher incidence of distant spread.=20
      <P>Adverse prognostic factors are as follows:=20
      <P>
      <UL>
        <LI>Higher stage at diagnosis (lymph node and/or soft tissue=20
        involvement)=20
        <P></P>
        <LI>Advanced age (&gt;60 y)=20
        <P></P>
        <LI>Poor performance index </LI></UL>
      <P>One study noted higher local recurrence rates in lesions of the =
jaw,=20
      and another study found lower survival rates in patients with =
lesions=20
      involving the pelvic bones. In children, hypercalcemia is =
associated with=20
      a poorer prognosis. No prognostic significance has been attached =
to sex of=20
      patient, histologic type of lymphoma, size of primary lesion, and=20
      treatment modality.
      <P><A name=3Dsection~future_and_controversies>
      <TABLE borderColor=3D#333399 cellSpacing=3D0 cellPadding=3D4 =
width=3D"99%"=20
      border=3D1>
        <TBODY>
        <TR bgColor=3D#333399>
          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>FUTURE AND =
CONTROVERSIES=20
            </B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 9 of =
11&nbsp;&nbsp;&nbsp;</B></FONT><A=20
            =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#section~outcome_an=
d_prognosis"><IMG=20
            height=3D10=20
            alt=3D"Click here to go to the previous section in this =
topic"=20
            src=3D"http://www.emedicine.com/images/back3.gif" width=3D31 =

            align=3Dmiddle border=3D0></A> <A class=3Dtopnav=20
            =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#"><IMG=20
            title=3D"Click here to go to the top of this page" =
height=3D10=20
            alt=3D"Click here to go to the top of this page"=20
            src=3D"http://www.emedicine.com/images/top4.gif" width=3D31 =
align=3Dmiddle=20
            border=3D0></A> <A=20
            =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#section~pictures">=
<IMG=20
            height=3D10 alt=3D"Click here to go to the next section in =
this topic"=20
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        <TR>
          <TD colSpan=3D3>
            <TABLE class=3D11pxarial cellSpacing=3D0 cellPadding=3D1 =
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              <TBODY>
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                  size=3D1><A=20
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ormation">Author=20
                  Information</A> <A=20
                  title=3D"Click here to view the Introduction section =
of this topic "=20
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                  <A=20
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                  <A=20
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Contraindications section of this topic "=20
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                  Anatomy And Contraindications</A> <A=20
                  title=3D"Click here to view the Workup section of this =
topic "=20
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rkup</A>=20
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>Treatment</A>=20
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of this topic "=20
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ons">Complications</A>=20
                  <A=20
                  title=3D"Click here to view the Outcome And Prognosis =
section of this topic "=20
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href=3D"http://www.emedicine.com/orthoped/topic514.htm#section~outcome_an=
d_prognosis">Outcome=20
                  And Prognosis</A> <A=20
                  title=3D"Click here to view the Future And =
Controversies section of this topic "=20
                  =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#section~future_and=
_controversies">Future=20
                  And Controversies</A> <A=20
                  title=3D"Click here to view the Pictures section of =
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LE>
      <P><!--Body:section~future_and_controversies-->The relative rarity =
of=20
      primary lymphoma of bone has resulted in the absence of =
standardized=20
      definitions for the disease and therapeutic trials. Studies in the =

      literature mostly are retrospective, and the numbers of patients =
usually=20
      are too small for subgroup analysis. Prospective studies are =
needed to=20
      clarify the impact of histologic subtype and therapeutic =
modalities on=20
      outcome.
      <P><A name=3Dsection~pictures>
      <TABLE borderColor=3D#333399 cellSpacing=3D0 cellPadding=3D4 =
width=3D"99%"=20
      border=3D1>
        <TBODY>
        <TR bgColor=3D#333399>
          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>PICTURES =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 10 of=20
            11&nbsp;&nbsp;&nbsp;</B></FONT><A=20
            =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#section~future_and=
_controversies"><IMG=20
            height=3D10=20
            alt=3D"Click here to go to the previous section in this =
topic"=20
            src=3D"http://www.emedicine.com/images/back3.gif" width=3D31 =

            align=3Dmiddle border=3D0></A> <A class=3Dtopnav=20
            =
href=3D"http://www.emedicine.com/orthoped/topic514.htm#"><IMG=20
            title=3D"Click here to go to the top of this page" =
height=3D10=20
            alt=3D"Click here to go to the top of this page"=20
            src=3D"http://www.emedicine.com/images/top4.gif" width=3D31 =
align=3Dmiddle=20
            border=3D0></A> <A=20
            =
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LE>
      <P><!--Body:section~pictures-->
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 1.=20
            Malignant lymphoma. An elderly woman presents with =
complaints of=20
            left shoulder pain of several months duration. Plain =
radiograph of=20
            the left shoulder (glenoid view) reveals a destructive lytic =
process=20
            eroding the cortical margins of the acromial process. Same =
patient=20
            as in Images 2-6.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1079AD01.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1079AD01.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1079AD01.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1079AD01.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        X-RAY</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 2.=20
            Malignant lymphoma. Total skeleton technetium Tc 99m nuclear =

            medicine scan shows increased uptake in the left acromion, =
the site=20
            of bone involvement by lymphoma in this patient. Initial=20
            differential diagnosis suggested metastatic disease to bone =
in=20
            addition to multiple myeloma and lymphoma, in that order. =
Same=20
            patient as in Image 1 and Images 3-6.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1080AD02.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1080AD02.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1080AD02.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1080AD02.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        X-RAY</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 3.=20
            Malignant lymphoma. Coronal T1-weighted MRI of the left =
shoulder=20
            reveals replacement of the left acromion by a low-signal =
process=20
            extending into the surrounding soft tissue. Same patient as =
in=20
            Images 1-2 and Images 4-6.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1081AD03.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1081AD03.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1081AD03.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1081AD03.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        MRI</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 4.=20
            Malignant lymphoma. Coronal T2-weighted MRI of the left =
shoulder=20
            reveals a high signal process involving the left acromion =
and=20
            extending to the surrounding soft tissue. The MRI features =
are=20
            suggestive only of a very high cellularity fluid-containing =
process=20
            but are nonspecific, and biopsy is required for a specific=20
            diagnosis. Same patient as in Images 1-3 and Images =
5-6.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1082AD04.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1082AD04.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1082AD04.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click tosee detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1082AD04.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        MRI</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 5.=20
            Malignant lymphoma. Sections of the biopsy show a diffuse =
infiltrate=20
            of atypical large lymphoid cells with vesicular nuclei, =
small=20
            nucleoli, and moderate cytoplasm. Small reactive lymphocytes =
are in=20
            the background. Same patient as in Images 1-4 and Image =
6.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1083AD05.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1083AD05.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1083AD05.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1083AD05.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        Photo</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 6.=20
            Malignant lymphoma. An immunohistochemical stain using an =
antibody=20
            directed against CD20 (B-cell marker) shows strong =
positivity in the=20
            large lymphoid cells. This is an example of a diffuse large =
B-cell=20
            lymphoma. Same patient as in Images 1-5.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1084AD06.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1084AD06.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1084AD06.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1084AD06.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        Photo</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 7.=20
            Malignant lymphoma. This woman, early in her fifth decade of =
life,=20
            presents with progressive left thigh pain and a limp.=20
            Anteroposterior left proximal femur radiograph reveals a =
lytic=20
            destructive process involving the subtrochanteric region =
with=20
            medical cortical erosion, soft tissue extension, and an =
associated=20
            lesser trochanteric avulsion fracture. The proximal femur is =
the=20
            most common site for primary bone lymphoma. Same patient as =
in=20
            Images 8-10.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1085DC01.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1085DC01.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1085DC01.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1085DC01.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        X-RAY</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 8.=20
            Malignant lymphoma. Total skeleton technetium Tc 99m nuclear =

            medicine scan reveals isolated increased uptake in the left =
proximal=20
            femur at the site of this patient=92s bone lymphoma. Same =
patient as=20
            in Image 7 and Images 9-10.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1086DC02.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1086DC02.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1086DC02.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1086DC02.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        X-RAY</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 9.=20
            Malignant lymphoma. Diffuse infiltrate of large lymphoid =
cells is=20
            present, with cleared cytoplasm and hyperchromatic nuclei. =
Admixed=20
            small reactive lymphocytes are also noted. Same patient as =
in Images=20
            7-8 and Image 10.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1087DC03.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1087DC03.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1087DC03.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1087DC03.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        Photo</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 10.=20
            Malignant lymphoma. The immunohistochemical stain using an =
antibody=20
            against CD20 is positive in the large cells; this is a =
diffuse large=20
            B-cell lymphoma. Same patient as in Images 7-9.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1088DC04.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1088DC04.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1088DC04.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1088DC04.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        Photo</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 11.=20
            Malignant lymphoma. Clinical photo of left shoulder shows a=20
            prominence in the mid portion of the left clavicle in this=20
            45-year-old man with local pain and tenderness. He had no =
history of=20
            prior trauma. Same patient as in Images 12-14.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1089KH01.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1089KH01.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1089KH01.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1089KH01.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        Photo</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 12.=20
            Malignant lymphoma. Technetium Tc 99m total skeleton nuclear =

            medicine scan shows increased uptake in the mid portion of =
the left=20
            clavicle corresponding to the clinical site of bone =
enlargement.=20
            Same patient as in Image 11 and Images 13-14.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1090KH02.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1090KH02.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1090KH02.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1090KH02.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        X-RAY</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 13.=20
            Malignant lymphoma. Anteroposterior radiograph of left =
clavicle=20
            reveals a mixed lytic and sclerotic destructive process =
within the=20
            mid portion of the bone with indistinct, permeative borders. =
Same=20
            patient as in Images 11-12 and Image 14.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1091KH03.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1091KH03.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1091KH03.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1091KH03.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        X-RAY</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 14.=20
            Malignant lymphoma. Another example of a diffuse large cell=20
            lymphoma. In addition to the large lymphoid cells with =
moderate=20
            cytoplasm, a few cells with lobated nuclei are also seen. =
Such cells=20
            are often seen in large cell lymphoma of the bone. Same =
patient as=20
            in Images 11-13.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1092KH04.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1092KH04.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1092KH04.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1092KH04.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        Photo</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 15.=20
            Malignant lymphoma. Plain radiographs in this 12-year-old =
patient=20
            with severely progressive right shoulder pain were =
interpreted as=20
            being normal. At most, they show localized osteopenia in the =
right=20
            proximal humerus but no discrete lesion within the bone. The =
patient=20
            was thought to have referred pain from the cervical region =
or=20
            brachial plexus based upon initial evaluation and plain =
radiographs.=20
            Same patient as in Images 16-17.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1076LG01.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1076LG01.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1076LG01.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1076LG01.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        X-RAY</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 16.=20
            Malignant lymphoma. T1-weighted coronal MRI of upper thorax =
and=20
            bilateral shoulders reveals a marrow replacement low signal =
process=20
            involving the entire right proximal humerus. The =
corresponding=20
            T2-weighted MRI showed a high signal process in this area. =
This MRI=20
            was done after plain radiographs were interpreted as normal =
and an=20
            MRI of the cervical spine and brachial plexus revealed the=20
            unsuspected findings in the humerus. Same patient as in =
Image 15 and=20
            Image 17.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1077LG02.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1077LG02.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1077LG02.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1077LG02.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        MRI</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 17.=20
            Malignant lymphoma. Histologic sections reveal a highly =
cellular=20
            neoplasm composed of cells with high nuclear to cytoplasmic =
ratio,=20
            scant cytoplasm, and fine nuclear chromatin. The cells =
showed=20
            immunohistochemical evidence of B-cell lineage, and =
expressed=20
            terminal deoxynucleotidyl transferase (TdT), consistent with =
a=20
            precursor B-lymphoblastic lymphoma. Same patient as in =
Images=20
          15-16.</TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300 rowSpan=3D2><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1078LG03.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/orthoped/images/1078LG03.jpg"></A></TD>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1078LG03.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see detail"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>View Full=20
            Size Image</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle width=3D300><A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/makezoom@/em/makezoom=
?picture=3D\websites\emedicine\orthoped\images\Large\1078LG03.jpg"=20
            target=3D_new><IMG alt=3D"Click to Zoom"=20
            src=3D"http://www.emedicine.com/images/magnify.gif" =
border=3D0>eMedicine=20
            Zoom View (Interactive!)</A></TD></TR>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Picture =
Type:</STRONG>=20
        Photo</TD></TR></TBODY></TABLE><A name=3Dsection~bibliography>
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          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>BIBLIOGRAPHY =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 11 of=20
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                  Information</A> <A=20
                  title=3D"Click here to view the Introduction section =
of this topic "=20
                  =
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                  <A=20
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LE>
      <P><!--Body:section~bibliography-->
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        <LI>Chan JK, Ng CS, Hui PK: Anaplastic large cell Ki-1 lymphoma =
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class=3D"13pxarial"><a href=3D"/orthoped/contents.htm">Table of =
Contents</a><br><a href=3D"/orthoped/topiclist.htm">Alphabetical Index =
of Topics</a><br><br><a =
href=3D"/orthoped/BIOMECHANICS.htm">Biomechanics</a><br><a =
href=3D"/orthoped/ELBOW.htm">Elbow</a><br><a =
href=3D"/orthoped/FOOT_AND_ANKLE.htm">Foot And Ankle</a><br><a =
href=3D"/orthoped/HAND_AND_UPPER_EXTREMITY.htm">Hand And Upper =
Extremity</a><br><a href=3D"/orthoped/HIP.htm">Hip</a><br><a =
href=3D"/orthoped/KNEE.htm">Knee</a><br> </td>=0A=
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class=3D"13pxarial"><br><br><br><a =
href=3D"/orthoped/NEOPLASMS.htm">Neoplasms</a><br><a =
href=3D"/orthoped/PEDIATRICS.htm">Pediatrics</a><br><a =
href=3D"/orthoped/SHOULDER.htm">Shoulder</a><br><a =
href=3D"/orthoped/SPINE.htm">Spine</a><br><a =
href=3D"/orthoped/SYSTEMIC_DISEASES.htm">Systemic Diseases</a><br><a =
href=3D"/orthoped/TRAUMA.htm">Trauma</a><br> </td>=0A=
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          <td width=3D"137" valign=3D"top" class=3D"tinytext"> Jason H =
Calhoun, MD, FAAOS<br>Harris Gellman, MD<br>Dennis P Grogan, MD<br>Mary =
Ann E Keenan, MD<br>Carlos J Lavernia, MD<br> </td>=0A=
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      <table width=3D"190" height=3D"112" border=3D"0" cellpadding=3D"0" =
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background=3D"http://www.emedicine.com/images/ui/bar.gif">&nbsp;</td>=0A=
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Bruggeman<br>Deborah M Eng<br>Jessica B Johnson<br>Jennifer =
Miller<br>Kelly Nikkila<br>Tammy Pomernackas<br>Nancy J Taubenheim, =
DPT<br> </td>=0A=
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background=3D"http://www.emedicine.com/images/ui/bar.gif">&nbsp;</td>=0A=
          <td width=3D"137" valign=3D"top" class=3D"tinytext"> Dinesh =
Patel, MD<br>Amer Suleman, MD<br></td>=0A=
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      <table width=3D"190" height=3D"112" border=3D"0" cellpadding=3D"0" =
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Talavera, PharmD, PhD<br> </td>=0A=
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          <td width=3D"137" valign=3D"top" class=3D"tinytext">Thomas A =
Ambrose II, MD<br>Jonathan Black, PhD<br>Robert D Bronstein, =
MD<br>Howard A Chansky, MD<br>Michael S Clarke, MD<br>Lynn A Crosby, MD, =
FACS<br>Timothy Damron, MD<br>James K DeOrio, MD<br>John S Early, =
MD<br>Dennis P Grogan, MD<br>William J Hozack, MD<br>William L Jaffe, =
MD<br>James F Kellam, MD<br>Mininder S Kocher, MD, MPH<br>Jegan =
Krishnan, MBBS, FRACS, PhD<br>Cato T Laurencin, MD, PhD<br>Mark D =
Lazarus, MD<br>M Mike Malek, MD, FACS<br>Phillip J Marone, MD<br>Charles =
T Mehlman, DO, MPH<br>Peter M Murray, MD<br>N Ake Nystrom, MD, PhD<br>A =
Lee Osterman, MD<br>Albert W Pearsall IV, MD<br>Steven Rabin, =
MD<br>Daniel Riew, MD<br>Lee H Riley III, MD<br>Miguel A Schmitz, =
MD<br>Joseph E Sheppard, MD<br>Heidi M Stephens, MD, MBA<br>Michael E =
Torchia, MD<br>Alexander R Vaccaro, MD<br>Jeffrey L Visotsky, MD<br> =
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Agnew, MD, FACS<br>Jason H Calhoun, MD, FAAOS<br>Arturo Corces, =
MD<br>Thomas M DeBerardino, MD<br>Paul E Di Cesare, MD, FACS<br>Robert H =
Fitzgerald, Jr, MD<br>Thomas R Hunt III, MD<br>Shepard R Hurwitz, =
MD<br>Pekka A Mooar, MD<br>Robert J Nowinski, DO<br>N Ake Nystrom, MD, =
PhD<br>Sean P Scully, MD, PhD<br>William O Shaffer, MD<br>George H =
Thompson, MD<br>John W Uribe, MD<br>Jerome D Wiedel, MD<br>Michael =
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