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Subject: eMedicine - Chondrosarcoma : Article by Geoff Hide, MBBS, MRCP, FRCR
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primary malignant tumor of bone, representing approximately 25% of all =
primary osseous neoplasms. Chondrosarcomas are a group of tumors with =
highly diverse features and behavior patterns, ranging from slow-growing =
non-metastasizing lesions to highly aggressive metastasizing =
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            <H2>Chondrosarcoma</H2><FONT size=3D2><B>Last Updated:</B> =
December=20
            13, 2002 </FONT></TD>
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          <TD class=3D13pxarial colSpan=3D2><B>Synonyms and related =
keywords:</B>=20
            bone tumors, primary bone tumor, bone malignancy, primary =
osseous=20
            neoplasms, sarcomas, chondroid, conventional =
chondrosarcomas,=20
            central chondrosarcoma, peripheral chondrosarcoma, =
enchondroma,=20
            osteochondroma, clear cell chondrosarcoma, myxoid =
chondrosarcoma,=20
            mesenchymal chondrosarcoma, dedifferentiated chondrosarcoma=20
        </TD></TR></TBODY></TABLE>
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            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 =
12&nbsp;&nbsp;&nbsp;</B></FONT>=20
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Angiography</A>=20
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LE>
      <P><!--Body:section~author_information-->
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        <TBODY>
        <TR>
          <TD>Author: <A=20
            =
href=3D"http://www.emedicine.com/cgi-bin/foxweb.exe/screen@d:/em/ga?book=3D=
radio&amp;authorid=3D9226&amp;topicid=3D168"><STRONG>Geoff=20
            Hide, MBBS, MRCP, FRCR</STRONG></A>, Consultant =
Musculoskeletal=20
            Radiologist, Department of Radiology, Freeman Hospital; =
Honorary=20
            Clinical Lecturer, Faculty of Medical Sciences, University =
of=20
            Newcastle upon Tyne
            <P></P></TD></TR>
        <TR>
          <TD>Geoff Hide, MBBS, MRCP, FRCR, is a member of the following =

            medical societies: <A=20
            =
href=3D"http://www.bma.org.uk/ap.nsf/Content/__Home_Public">British=20
            Medical Association</A>, <A =
href=3D"http://www.rcplondon.ac.uk/">Royal=20
            College of Physicians</A>, and <A =
href=3D"http://www.rcr.ac.uk/">Royal=20
            College of Radiologists</A>
            <P></P></TD></TR>
        <TR>
          <TD>Editor(s): <STRONG>Michael A Bruno, MD</STRONG>, Chair,=20
            Department of Radiology, Maricopa Medical Center; =
<STRONG>Bernard D=20
            Coombs, MBChB, PhD</STRONG>, Consulting Staff, Department of =

            Specialist Rehabilitation Services, Hutt Valley District =
Health=20
            Board, New Zealand; <STRONG>Murali Sundaram, MBBS, =
FRCR</STRONG>,=20
            Department of Radiology, Mayo Clinic of Rochester; =
<STRONG>Robert M=20
            Krasny, MD</STRONG>, Visiting Assistant Professor of =
Radiology,=20
            University of California at Los Angeles Medical Center; =
Consulting=20
            Staff, Tower Imaging, Los Angeles, California; and =
<STRONG>Felix S=20
            Chew, MD, EdM</STRONG>, Vice-Chair for Education, Section =
Head of=20
            Musculoskeletal Radiology, Professor, Department of =
Radiology, Wake=20
            Forest University School of Medicine =
</TD></TR></TBODY></TABLE><A=20
      name=3Dsection~introduction>
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width=3D"99%"=20
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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 =
12&nbsp;&nbsp;&nbsp;</B></FONT><A=20
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href=3D"http://www.emedicine.com/radio/topic168.htm#section~author_inform=
ation"><IMG=20
            height=3D10=20
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topic"=20
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LE>
      <P><!--Body:section~introduction--><STRONG>Background:=20
      </STRONG>Chondrosarcoma is the second most frequent primary =
malignant=20
      tumor of bone, representing approximately 25% of all primary =
osseous=20
      neoplasms. Chondrosarcomas are a group of tumors with highly =
diverse=20
      features and behavior patterns, ranging from slow-growing=20
      non-metastasizing lesions to highly aggressive metastasizing =
sarcomas.
      <P>
      <P><STRONG>Pathophysiology: </STRONG>Chondrosarcoma is a malignant =
tumor=20
      of cartilaginous origin, in which the tumor matrix formation is =
entirely=20
      chondroid in nature.=20
      <P>Chondrosarcomas are classified as central (originating within =
the=20
      intramedullary canal) or peripheral. Rarely, they may arise as =
juxta=20
      cortical lesions. Lesions are designated as primary when they =
arise de=20
      novo or as secondary when they occur within a preexisting lesion =
such as=20
      an enchondroma or osteochondroma.=20
      <P>Tumors are further categorized by grade. Grade 1 represents the =
least=20
      aggressive in terms of histologic features, and grade 3 represents =
the=20
      most aggressive. Most chondrosarcomas are pathologically =
classified as=20
      conventional, but other subgroups are clear cell, myxoid, =
mesenchymal, and=20
      dedifferentiated. This article deals exclusively with conventional =

      chondrosarcomas of the bone.
      <P>
      <P><STRONG>Frequency: </STRONG><BR>
      <UL>
        <LI><STRONG>In the US: </STRONG>The incidence rate of =
chondrosarcoma is=20
        dependent on patient age, peaking at 8 cases per 1 million =
population in=20
        those aged 80-84 years. The incidence in children is low. Most =
tumors=20
        arise in patients older than 40 years. The risk of =
chondrosarcoma is=20
        increased in people with enchondromatosis syndromes (eg, Ollier =
disease,=20
        Maffucci syndrome, metachondromatosis) and in those with =
hereditary=20
        multiple exostosis (eg, diaphyseal aclasis). Patients with these =

        conditions are generally younger than other patients at =
presentation.=20
        </LI></UL>
      <P><STRONG>Mortality/Morbidity: </STRONG>The overall prognosis is =
related=20
      to the size of the lesion, its anatomic location, and its =
histologic=20
      grade.=20
      <UL>
        <LI>Axial lesions have a worse prognosis than those in the =
appendicular=20
        skeleton. </LI></UL>
      <UL>
        <LI>The 5-year survival rate for grade 1 lesions is 90%, and the =
rate=20
        decreases to 29% for grade 3 tumors. Grade 1 lesions do not =
metastasize.=20
        Metastatic spread, typically pulmonary, is more frequently =
associated=20
        with grade 3 lesions than with others. Lymph node spread is more =
common=20
        than with other osseous neoplasms. </LI></UL>
      <UL>
        <LI>Tumor recurrence typically occurs 5-10 years after surgery, =
and it=20
        is often associated with more aggressive behavior and a =
histologic grade=20
        higher than that of the original lesion. </LI></UL>
      <P><STRONG>Race: </STRONG>No major difference in incidence is =
observed=20
      between ethnic groups.=20
      <P><STRONG>Sex: </STRONG>A slight male predilection exists, with a =

      male-to-female ratio of 1.5-2:1.=20
      <P><STRONG>Age: </STRONG>The age range is wide, but most cases =
occur in=20
      patients older than 40 years.=20
      <UL>
        <LI>Secondary chondrosarcomas tend to occur in younger patients, =
namely,=20
        those aged 20-40 years. </LI></UL>
      <UL>
        <LI>Chondrosarcoma is rare in children, but it tends to be =
aggressive.=20
        </LI></UL>
      <P><STRONG>Anatomy: </STRONG>Tumors are predominantly axial, and =
they most=20
      commonly involve the pelvic bones, femur, humerus, ribs, scapula, =
sternum,=20
      or spine. In tubular bones, the metaphysis is the most common site =
of=20
      origin. The proximal metaphysis is more frequently involved than =
the=20
      distal end of the bone. Involvement of the distal humerus is most =
unusual.=20
      Chondrosarcoma is rare in the hands and feet and usually occurs as =
a=20
      complication of a multiple enchondromatosis syndrome. =
Chondrosarcoma=20
      arising de novo in the hands and feet is also extremely unusual.
      <P><STRONG>Clinical Details: </STRONG>The most common symptom at=20
      presentation is pain, which is often present for months and =
typically dull=20
      in character. It may be worse at night. Local swelling may be =
present, and=20
      when the tumor occurs close to a joint, effusion may be present, =
or=20
      movement may be restricted. The average duration of symptoms prior =
to=20
      presentation is 1-2 years. The tumor may occasionally occur as a=20
      pathologic fracture.
      <P><STRONG>Preferred Examination: </STRONG>Radiographs are =
essential for=20
      the initial diagnosis, and it is sometimes supplemented with CT, =
which is=20
      more sensitive for detecting matrix calcification and for =
confirming deep=20
      endosteal cortical scalloping in intramedullary tumors.=20
      <P>MRI is the preferred modality for evaluating the extent of=20
      intramedullary tumors and demonstrating extraosseous extension. =
MRI is=20
      useful in evaluating the thickened cartilage cap in an =
osteochondroma that=20
      develops a secondary chondrosarcoma. MRI is less sensitive than CT =
in=20
      identifying small amounts of matrix calcification within a tumor.=20
      <P>The imaging appearances of chondrosarcoma can overlap with =
those of=20
      other lesions, especially other cartilaginous tumors such as =
enchondroma.=20
      The presence of pain with any lesion (without a pathologic =
fracture in=20
      lesions of the hands and feet) is highly suggestive of malignancy. =
Other=20
      findings suggestive of malignancy in a cartilaginous tumor include =

      endosteal cortical scalloping of more than two thirds of the =
thickness of=20
      the cortex, ill-defined border and/or zone of transition, and a =
large=20
      soft-tissue mass. Both benign and malignant cartilaginous tumors =
may show=20
      a central lucency. However, lucency of an area that previously =
showed=20
      matrix calcification is a highly suggestive feature.
      <P><STRONG>Limitations of Techniques: </STRONG>See Preferred =
Examination=20
      above.<A name=3Dsection~differentials>
      <TABLE borderColor=3D#333399 cellSpacing=3D0 cellPadding=3D4 =
width=3D"99%"=20
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          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>DIFFERENTIALS =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 3 of =
12&nbsp;&nbsp;&nbsp;</B></FONT><A=20
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href=3D"http://www.emedicine.com/radio/topic168.htm#section~introduction"=
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LE>
      <P><!--Body:section~differentials--></STRONG><A=20
      href=3D"http://www.emedicine.com/RADIO/topic86.htm">Bone Infarct =
</A><BR><A=20
      href=3D"http://www.emedicine.com/RADIO/topic247.htm">Enchondroma =
and=20
      Enchondromatosis </A><BR><A=20
      =
href=3D"http://www.emedicine.com/RADIO/topic496.htm">Osteochondroma and=20
      Osteochondromatosis </A><BR><A=20
      href=3D"http://www.emedicine.com/RADIO/topic504.htm">Osteosarcoma, =
Classic=20
      </A><BR><A=20
      href=3D"http://www.emedicine.com/RADIO/topic505.htm">Osteosarcoma, =
Variants=20
      </A><BR>
      <P><BR><STRONG>Other Problems to be Considered: </STRONG>
      <P><B>Central</B> =
<BR>Enchondroma<BR>Osteosarcoma<BR>Fibrosarcoma<BR>Bone=20
      infarct<BR><BR><B>Peripheral</B><BR>Osteochondroma <BR>Parosteal=20
      osteosarcoma
      <P><A name=3Dsection~x-ray>
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            face=3Darial,helvetica color=3Dwhite><B>X-RAY =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 4 of =
12&nbsp;&nbsp;&nbsp;</B></FONT><A=20
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LE>
      <P><!--Body:section~x-ray-->
      <P><STRONG>Findings: </STRONG>Radiographs typically show a lucent =
lesion,=20
      which frequently contains matrix calcification, particularly in=20
      well-differentiated tumors. The degree of organization of the =
matrix=20
      calcification can be correlated with the grade of the tumor. =
Aggressive=20
      tumors contain irregular calcifications, and they often have large =
areas=20
      showing no calcification at all. Well-differentiated lesions tend =
to have=20
      more developed matrix with the typical appearance of rings and =
arcs.=20
      <P>The margin of intramedullary lesions is determined by the =
degree of=20
      aggression of the tumor, and it is frequently ill defined. =
Endosteal=20
      scalloping may be present, and when its depth is more than two =
thirds the=20
      normal thickness of the cortex, this scalloping is useful in=20
      distinguishing chondrosarcoma from enchondroma, except in lesions =
of the=20
      hands and feet. Benign enchondromas in these areas can cause =
considerable=20
      cortical thinning, and they may occur as a pathologic fracture.=20
      <P>Cortical destruction and/or a soft-tissue mass are indicators =
of the=20
      malignant nature of the tumor. Destruction of matrix calcification =
that=20
      was previously visible in an enchondroma is also an indicator of =
malignant=20
      transformation.
      <P><STRONG>Degree of Confidence: </STRONG>The size of the tumor is =
often=20
      poorly assessed on radiographs alone, and MRI is advised to =
demonstrate=20
      both the intramedullary and the soft-tissue extent of the lesion. =
CT can=20
      be helpful in identifying matrix calcification in some lesions =
that appear=20
      entirely lucent on radiographs.<!-- endrow1column1 =
--></P></A></TD>
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this topic "=20
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ltrasound</A><BR><A=20
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section of this topic "=20
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ine">Nuclear=20
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this&#10;topic "=20
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Angiography</A><BR><A=20
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of this topic "=20
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                <TD class=3Dsmalltext><A=20
                  =
href=3D"http://www.emedicine.com/RADIO/topic86.htm">Bone Infarct=20
                  </A><BR><BR><A=20
                  =
href=3D"http://www.emedicine.com/RADIO/topic247.htm">Enchondroma=20
                  and Enchondromatosis </A><BR><BR><A=20
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href=3D"http://www.emedicine.com/RADIO/topic496.htm">Osteochondroma=20
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                  Variants </A><BR><BR>
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    <TD colSpan=3D2><!-- beginrow2column1 --><BR><A =
name=3Dsection~cat_scan>
      <TABLE borderColor=3D#333399 cellSpacing=3D0 cellPadding=3D4 =
width=3D"99%"=20
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          <TD>&nbsp;</TD>
          <TD vAlign=3Dcenter bgColor=3D#333399 height=3D24><FONT=20
            face=3Darial,helvetica color=3Dwhite><B>CAT SCAN =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 5 of =
12&nbsp;&nbsp;&nbsp;</B></FONT><A=20
            =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~x-ray"><IMG=20
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            alt=3D"Click here to go to the previous section in this =
topic"=20
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            align=3Dmiddle border=3D0></A> <A class=3Dtopnav=20
            href=3D"http://www.emedicine.com/radio/topic168.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/radio/topic168.htm#section~mri"><IMG=20
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          <TD colSpan=3D3>
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width=3D"99%">
              <TBODY>
              <TR>
                <TD><FONT face=3D"Arial, Helvetica, sans-serif" =
color=3D#ffffff=20
                  size=3D1><A=20
                  title=3D"Click here to view the Author Information =
section of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~author_inform=
ation">Author=20
                  Information</A> <A=20
                  title=3D"Click here to view the Introduction section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~introduction"=
>Introduction</A>=20
                  <A=20
                  title=3D"Click here to view the Differentials section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~differentials=
">Differentials</A>=20
                  <A title=3D"Click here to view the X-ray section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~x-ray">X-ray<=
/A>=20
                  <A=20
                  title=3D"Click here to view the Cat Scan section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~cat_scan">Cat=
=20
                  Scan</A> <A=20
                  title=3D"Click here to view the MRI section of this =
topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~mri">MRI</A> =

                  <A=20
                  title=3D"Click here to view the Ultrasound section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~ultrasound">U=
ltrasound</A>=20
                  <A=20
                  title=3D"Click here to view the Nuclear Medicine =
section of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~nuclear_medic=
ine">Nuclear=20
                  Medicine</A> <A=20
                  title=3D"Click here to view the Angiography section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~angiography">=
Angiography</A>=20
                  <A=20
                  title=3D"Click here to view the Intervention section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~intervention"=
>Intervention</A>=20
                  <A=20
                  title=3D"Click here to view the Pictures section of =
this topic "=20
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href=3D"http://www.emedicine.com/radio/topic168.htm#section~pictures">Pic=
tures</A>=20
                  <A=20
                  title=3D"Click here to view the Bibliography section =
of this topic "=20
                  =
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>Bibliography</A><BR><FONT=20
                  =
size=3D+0></FONT></FONT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TAB=
LE>
      <P><!--Body:section~cat_scan-->
      <P><STRONG>Findings: </STRONG>In as many as 90% of cases, tumors =
appear as=20
      lucent areas containing chondroid matrix calcification. Endosteal=20
      scalloping and cortical destruction are frequently easier to =
appreciate on=20
      CT scans than on radiographs.=20
      <P>CT can be used to guide percutaneous biopsy, and it is the =
modality of=20
      choice for investigating possible pulmonary metastatic disease.
      <P><STRONG>Degree of Confidence: </STRONG>CT can often be used to=20
      successfully categorize the lesion as being of cartilaginous =
origin. Its=20
      medullary extent can be assessed more accurately with CT than with =

      radiography. However, MRI is superior, and it is also the most =
useful=20
      modality for determining soft tissue extension.<A =
name=3Dsection~mri>
      <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>MRI </B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 6 of =
12&nbsp;&nbsp;&nbsp;</B></FONT><A=20
            =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~cat_scan"><IM=
G=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/radio/topic168.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/radio/topic168.htm#section~ultrasound"><=
IMG=20
            height=3D10 alt=3D"Click here to go to the next section in =
this topic"=20
            src=3D"http://www.emedicine.com/images/next3.gif" width=3D31 =

            align=3Dmiddle border=3D0></A></TD></TR>
        <TR>
          <TD colSpan=3D3>
            <TABLE class=3D11pxarial cellSpacing=3D0 cellPadding=3D1 =
width=3D"99%">
              <TBODY>
              <TR>
                <TD><FONT face=3D"Arial, Helvetica, sans-serif" =
color=3D#ffffff=20
                  size=3D1><A=20
                  title=3D"Click here to view the Author Information =
section of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~author_inform=
ation">Author=20
                  Information</A> <A=20
                  title=3D"Click here to view the Introduction section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~introduction"=
>Introduction</A>=20
                  <A=20
                  title=3D"Click here to view the Differentials section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~differentials=
">Differentials</A>=20
                  <A title=3D"Click here to view the X-ray section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~x-ray">X-ray<=
/A>=20
                  <A=20
                  title=3D"Click here to view the Cat Scan section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~cat_scan">Cat=
=20
                  Scan</A> <A=20
                  title=3D"Click here to view the MRI section of this =
topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~mri">MRI</A> =

                  <A=20
                  title=3D"Click here to view the Ultrasound section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~ultrasound">U=
ltrasound</A>=20
                  <A=20
                  title=3D"Click here to view the Nuclear Medicine =
section of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~nuclear_medic=
ine">Nuclear=20
                  Medicine</A> <A=20
                  title=3D"Click here to view the Angiography section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~angiography">=
Angiography</A>=20
                  <A=20
                  title=3D"Click here to view the Intervention section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~intervention"=
>Intervention</A>=20
                  <A=20
                  title=3D"Click here to view the Pictures section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~pictures">Pic=
tures</A>=20
                  <A=20
                  title=3D"Click here to view the Bibliography section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~bibliography"=
>Bibliography</A><BR><FONT=20
                  =
size=3D+0></FONT></FONT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TAB=
LE>
      <P><!--Body:section~mri-->
      <P><STRONG>Findings: </STRONG>MRI typically demonstrates lobulated =
lesions=20
      of high signal intensity on T2-weighted images. Lobules are =
commonly=20
      separated by low-signal-intensity septa. On T1-weighted images, =
the lesion=20
      generally has low signal intensity.=20
      <P>Areas of matrix calcification are shown as signal voids on =
images=20
      obtained with all sequences, but small amounts may not be =
identifiable.=20
      MRI may demonstrate large aggregates of calcium, but tiny =
scattered=20
      calcifications may be completely missed because of partial-volume=20
      averaging. MRI can be used to assess soft tissue extension and the =

      intramedullary extent of the tumor. MRIs can demonstrate endosteal =

      cortical scalloping, but this feature is more easily assessed by =
using CT.=20

      <P>MRI is useful in assessing the thickness of the cartilage cap =
of=20
      osteochondromas to identify chondrosarcoma transformation. =
Chondrosarcomas=20
      show variable patterns of enhancement after the administration of =
contrast=20
      material.
      <P><STRONG>Degree of Confidence: </STRONG>MRI is the method of =
choice for=20
      clarifying the intramedullary and extraosseous extent of a =
chondrosarcoma,=20
      but features related to cortical bone and matrix calcification are =
more=20
      accurately assessed by using CT.<A name=3Dsection~ultrasound>
      <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>ULTRASOUND =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 7 of =
12&nbsp;&nbsp;&nbsp;</B></FONT><A=20
            =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~mri"><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/radio/topic168.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/radio/topic168.htm#section~nuclear_medic=
ine"><IMG=20
            height=3D10 alt=3D"Click here to go to the next section in =
this topic"=20
            src=3D"http://www.emedicine.com/images/next3.gif" width=3D31 =

            align=3Dmiddle border=3D0></A></TD></TR>
        <TR>
          <TD colSpan=3D3>
            <TABLE class=3D11pxarial cellSpacing=3D0 cellPadding=3D1 =
width=3D"99%">
              <TBODY>
              <TR>
                <TD><FONT face=3D"Arial, Helvetica, sans-serif" =
color=3D#ffffff=20
                  size=3D1><A=20
                  title=3D"Click here to view the Author Information =
section of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~author_inform=
ation">Author=20
                  Information</A> <A=20
                  title=3D"Click here to view the Introduction section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~introduction"=
>Introduction</A>=20
                  <A=20
                  title=3D"Click here to view the Differentials section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~differentials=
">Differentials</A>=20
                  <A title=3D"Click here to view the X-ray section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~x-ray">X-ray<=
/A>=20
                  <A=20
                  title=3D"Click here to view the Cat Scan section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~cat_scan">Cat=
=20
                  Scan</A> <A=20
                  title=3D"Click here to view the MRI section of this =
topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~mri">MRI</A> =

                  <A=20
                  title=3D"Click here to view the Ultrasound section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~ultrasound">U=
ltrasound</A>=20
                  <A=20
                  title=3D"Click here to view the Nuclear Medicine =
section of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~nuclear_medic=
ine">Nuclear=20
                  Medicine</A> <A=20
                  title=3D"Click here to view the Angiography section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~angiography">=
Angiography</A>=20
                  <A=20
                  title=3D"Click here to view the Intervention section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~intervention"=
>Intervention</A>=20
                  <A=20
                  title=3D"Click here to view the Pictures section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~pictures">Pic=
tures</A>=20
                  <A=20
                  title=3D"Click here to view the Bibliography section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~bibliography"=
>Bibliography</A><BR><FONT=20
                  =
size=3D+0></FONT></FONT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TAB=
LE>
      <P><!--Body:section~ultrasound-->
      <P><STRONG>Findings: </STRONG>Ultrasonography has no role in =
evaluating=20
      intramedullary lesions confined to the bone. It can demonstrate =
soft=20
      tissue extension; therefore, it may be useful in guiding =
percutaneous=20
      biopsy.=20
      <P>Ultrasonography is useful as a means of assessing the thickness =
of the=20
      cartilage cap overlying an osteochondroma, although access to the =
lesion=20
      can be difficult in certain areas. If the cap measures more than =
1.5 cm in=20
      a skeletally mature patient, transformation to chondrosarcoma may =
have=20
      occurred.<A name=3Dsection~nuclear_medicine>
      <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>NUCLEAR MEDICINE =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 8 of =
12&nbsp;&nbsp;&nbsp;</B></FONT><A=20
            =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~ultrasound"><=
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/radio/topic168.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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                  title=3D"Click here to view the MRI section of this =
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                  =
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                  <A=20
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ltrasound</A>=20
                  <A=20
                  title=3D"Click here to view the Nuclear Medicine =
section of this topic "=20
                  =
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ine">Nuclear=20
                  Medicine</A> <A=20
                  title=3D"Click here to view the Angiography section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~angiography">=
Angiography</A>=20
                  <A=20
                  title=3D"Click here to view the Intervention section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~intervention"=
>Intervention</A>=20
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LE>
      <P><!--Body:section~nuclear_medicine-->
      <P><STRONG>Findings: </STRONG>Central chondrosarcomas typically =
show=20
      significantly increased uptake of the radioisotope on isotopic =
bone scans,=20
      but differentiation between chondrosarcoma and enchondroma is =
unreliable.=20
      Uptake on isotopic bone scanning indicates metabolic activity in =
an=20
      osteochondroma, but it cannot be used to distinguish this type of =
uptake=20
      from uptake due to malignant transformation. The absence of =
increased=20
      uptake makes malignancy highly unlikely.
      <P><STRONG>Degree of Confidence: </STRONG>See Findings above.<A=20
      name=3Dsection~angiography>
      <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>ANGIOGRAPHY =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 9 of =
12&nbsp;&nbsp;&nbsp;</B></FONT><A=20
            =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~nuclear_medic=
ine"><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/radio/topic168.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/radio/topic168.htm#section~intervention"=
><IMG=20
            height=3D10 alt=3D"Click here to go to the next section in =
this topic"=20
            src=3D"http://www.emedicine.com/images/next3.gif" width=3D31 =

            align=3Dmiddle border=3D0></A></TD></TR>
        <TR>
          <TD colSpan=3D3>
            <TABLE class=3D11pxarial cellSpacing=3D0 cellPadding=3D1 =
width=3D"99%">
              <TBODY>
              <TR>
                <TD><FONT face=3D"Arial, Helvetica, sans-serif" =
color=3D#ffffff=20
                  size=3D1><A=20
                  title=3D"Click here to view the Author Information =
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ation">Author=20
                  Information</A> <A=20
                  title=3D"Click here to view the Introduction section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~introduction"=
>Introduction</A>=20
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of this topic "=20
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                  <A title=3D"Click here to view the X-ray section of =
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/A>=20
                  <A=20
                  title=3D"Click here to view the Cat Scan section of =
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=20
                  Scan</A> <A=20
                  title=3D"Click here to view the MRI section of this =
topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~mri">MRI</A> =

                  <A=20
                  title=3D"Click here to view the Ultrasound section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~ultrasound">U=
ltrasound</A>=20
                  <A=20
                  title=3D"Click here to view the Nuclear Medicine =
section of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~nuclear_medic=
ine">Nuclear=20
                  Medicine</A> <A=20
                  title=3D"Click here to view the Angiography section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~angiography">=
Angiography</A>=20
                  <A=20
                  title=3D"Click here to view the Intervention section =
of this topic "=20
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href=3D"http://www.emedicine.com/radio/topic168.htm#section~intervention"=
>Intervention</A>=20
                  <A=20
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tures</A>=20
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                  =
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LE>
      <P><!--Body:section~angiography-->
      <P><STRONG>Findings: </STRONG>Angiography is generally not =
required in the=20
      staging of chondrosarcoma.<A name=3Dsection~intervention>
      <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>INTERVENTION =
</B></FONT></TD>
          <TD align=3Dright bgColor=3D#333399><FONT =
face=3Darial,helvetica=20
            color=3Dwhite size=3D2><B>Section 10 of=20
            12&nbsp;&nbsp;&nbsp;</B></FONT><A=20
            =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~angiography">=
<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/radio/topic168.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/radio/topic168.htm#section~pictures"><IM=
G=20
            height=3D10 alt=3D"Click here to go to the next section in =
this topic"=20
            src=3D"http://www.emedicine.com/images/next3.gif" width=3D31 =

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        <TR>
          <TD colSpan=3D3>
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              <TBODY>
              <TR>
                <TD><FONT face=3D"Arial, Helvetica, sans-serif" =
color=3D#ffffff=20
                  size=3D1><A=20
                  title=3D"Click here to view the Author Information =
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ation">Author=20
                  Information</A> <A=20
                  title=3D"Click here to view the Introduction section =
of this topic "=20
                  =
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>Introduction</A>=20
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                  <A title=3D"Click here to view the X-ray section of =
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/A>=20
                  <A=20
                  title=3D"Click here to view the Cat Scan section of =
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=20
                  Scan</A> <A=20
                  title=3D"Click here to view the MRI section of this =
topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~mri">MRI</A> =

                  <A=20
                  title=3D"Click here to view the Ultrasound section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~ultrasound">U=
ltrasound</A>=20
                  <A=20
                  title=3D"Click here to view the Nuclear Medicine =
section of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~nuclear_medic=
ine">Nuclear=20
                  Medicine</A> <A=20
                  title=3D"Click here to view the Angiography section of =
this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~angiography">=
Angiography</A>=20
                  <A=20
                  title=3D"Click here to view the Intervention section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~intervention"=
>Intervention</A>=20
                  <A=20
                  title=3D"Click here to view the Pictures section of =
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tures</A>=20
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LE>
      <P><!--Body:section~intervention-->
      <P><STRONG>Intervention: </STRONG>Histologic confirmation of the =
nature of=20
      a lesion is required for optimal management. Although biopsy is =
often=20
      performed as an open surgical procedure, percutaneous biopsy with =
imaging=20
      guidance can be helpful in certain scenarios. Ultrasonography is =
useful=20
      for guiding needle biopsy of the soft tissue component of a tumor. =

      CT-guided percutaneous biopsy of bone lesions may be helpful, but =
the=20
      pathologic differentiation between benign and low-grade malignant=20
      chondrosarcomas is difficult. Needle biopsy samples may be =
inadequate to=20
      allow precise pathologic diagnosis, and open surgical biopsy is =
often=20
      performed.=20
      <P>The mainstay of treatment is surgical resection because =
chondrosarcomas=20
      respond poorly to chemotherapy or radiation therapy.
      <P><STRONG>Medical/Legal Pitfalls: </STRONG><BR>
      <UL>
        <LI>Although they are malignant tumors, chondrosarcomas often =
show=20
        features suggestive of a benign lesion.</LI></UL>
      <UL>
        <LI>Readers should be cautious not to mistake them for benign =
lesions=20
        because of their well-circumscribed appearance and lack of =
periosteal=20
        reaction.</LI></UL><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 11 of=20
            12&nbsp;&nbsp;&nbsp;</B></FONT><A=20
            =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~intervention"=
><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/radio/topic168.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/radio/topic168.htm#section~bibliography"=
><IMG=20
            height=3D10 alt=3D"Click here to go to the next section in =
this topic"=20
            src=3D"http://www.emedicine.com/images/next3.gif" width=3D31 =

            align=3Dmiddle border=3D0></A></TD></TR>
        <TR>
          <TD colSpan=3D3>
            <TABLE class=3D11pxarial cellSpacing=3D0 cellPadding=3D1 =
width=3D"99%">
              <TBODY>
              <TR>
                <TD><FONT face=3D"Arial, Helvetica, sans-serif" =
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                  size=3D1><A=20
                  title=3D"Click here to view the Author Information =
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ation">Author=20
                  Information</A> <A=20
                  title=3D"Click here to view the Introduction section =
of this topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~introduction"=
>Introduction</A>=20
                  <A=20
                  title=3D"Click here to view the Differentials section =
of this topic "=20
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                  <A title=3D"Click here to view the X-ray section of =
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/A>=20
                  <A=20
                  title=3D"Click here to view the Cat Scan section of =
this topic "=20
                  =
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=20
                  Scan</A> <A=20
                  title=3D"Click here to view the MRI section of this =
topic "=20
                  =
href=3D"http://www.emedicine.com/radio/topic168.htm#section~mri">MRI</A> =

                  <A=20
                  title=3D"Click here to view the Ultrasound section of =
this topic "=20
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href=3D"http://www.emedicine.com/radio/topic168.htm#section~ultrasound">U=
ltrasound</A>=20
                  <A=20
                  title=3D"Click here to view the Nuclear Medicine =
section of this topic "=20
                  =
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ine">Nuclear=20
                  Medicine</A> <A=20
                  title=3D"Click here to view the Angiography section of =
this topic "=20
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href=3D"http://www.emedicine.com/radio/topic168.htm#section~angiography">=
Angiography</A>=20
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                  title=3D"Click here to view the Intervention section =
of this topic "=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
            Chondrosarcoma. Frontal radiograph of the left fibula head=20
            demonstrates a lucent lesion that contains the typical =
chondroid=20
            matrix calcification. Low-grade tumor. </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\radio\images\Large\70497049Picture_1.jpg&a=
mp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70497049Picture_1.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\radio\images\Large\70497049Picture_1.jpg&a=
mp;template=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\radio\images\Large\70497049Picture_1.jpg" =

            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
            Chondrosarcoma. Frontal radiograph of the left acetabulum=20
            demonstrates an expansile lucent lesion with no internal =
matrix=20
            calcification (same patient as in Images 2-5). Low-grade =
central=20
            tumor. </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\radio\images\Large\70507050Picture_2.jpg&a=
mp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70507050Picture_2.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\radio\images\Large\70507050Picture_2.jpg&a=
mp;template=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\radio\images\Large\70507050Picture_2.jpg" =

            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
            Chondrosarcoma. Bone-window CT scan of left acetabulum =
demonstrates=20
            matrix calcification in the expansile lucent lesion in the =
anterior=20
            column (same patient as in Images 2-5). Low-grade central =
tumor.=20
        </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\radio\images\Large\70517051Picture_3.jpg&a=
mp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70517051Picture_3.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\radio\images\Large\70517051Picture_3.jpg&a=
mp;template=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\radio\images\Large\70517051Picture_3.jpg" =

            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
        CT</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 4.=20
            Chondrosarcoma. T2-weighted axial MRI of the pelvis =
demonstrates the=20
            high signal intensity of the acetabular lesion (same patient =
as in=20
            Images 2-5). Low-grade central tumor. </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\radio\images\Large\70527052Picture_4.jpg&a=
mp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70527052Picture_4.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\radio\images\Large\70527052Picture_4.jpg&a=
mp;template=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\radio\images\Large\70527052Picture_4.jpg" =

            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
            Chondrosarcoma. T1-weighted axial MRI of the pelvis =
demonstrates the=20
            low signal intensity of the acetabular lesion (same patient =
as in=20
            Images 2-5). Low-grade central tumor. </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\radio\images\Large\70537053Picture_5.jpg&a=
mp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70537053Picture_5.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\radio\images\Large\70537053Picture_5.jpg&a=
mp;template=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\radio\images\Large\70537053Picture_5.jpg" =

            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 6.=20
            Chondrosarcoma. Frontal radiograph of right side of upper =
abdomen=20
            demonstrates a destructive, expansile lesion of the 12th =
rib. The=20
            lesion contains irregular calcification (same patient as in =
Image=20
            7). High-grade central tumor. </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\radio\images\Large\70547054Picture_6.jpg&a=
mp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70547054Picture_6.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\radio\images\Large\70547054Picture_6.jpg&a=
mp;template=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\radio\images\Large\70547054Picture_6.jpg" =

            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 7.=20
            Chondrosarcoma. CT of the right side of the upper abdomen=20
            demonstrates the expansile tumor with a large associated =
soft-tissue=20
            mass containing foci of calcification (same patient as in =
Image 6).=20
            High-grade central tumor. </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\radio\images\Large\70557055Picture_7.jpg&a=
mp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70557055Picture_7.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\radio\images\Large\70557055Picture_7.jpg&a=
mp;template=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\radio\images\Large\70557055Picture_7.jpg" =

            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
        CT</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 8.=20
            Chondrosarcoma. Frontal radiograph of the pelvis =
demonstrates=20
            extensive calcification overlying the left ilium and in the =
lateral=20
            soft tissues. No bone destruction is shown (same patient as =
in=20
            Images 9-10). High-grade secondary peripheral tumor. =
</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\radio\images\Large\70567056Picture_8.jpg&a=
mp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70567056Picture_8.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\radio\images\Large\70567056Picture_8.jpg&a=
mp;template=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\radio\images\Large\70567056Picture_8.jpg" =

            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
            Chondrosarcoma. CT scan of the pelvis demonstrates a large=20
            soft-tissue mass that contains calcification arising from a=20
            broad-based sessile osteochondroma on the posterior aspect =
of the=20
            ilium (same patient as in Images 8 and 10). High-grade =
secondary=20
            peripheral tumor. </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\radio\images\Large\70577057Picture_9.jpg&a=
mp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70577057Picture_9.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\radio\images\Large\70577057Picture_9.jpg&a=
mp;template=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\radio\images\Large\70577057Picture_9.jpg" =

            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
        CT</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 10.=20
            Chondrosarcoma. T2-weighted axial MRI of the pelvis =
demonstrates a=20
            lobulated high-signal-intensity soft tissue with=20
            local-signal-intensity septa arising from the osteochondroma =
on the=20
            posterior aspect of the ilium (same patient as in Images =
9-10).=20
            Several areas of low signal intensity are shown; these =
correspond to=20
            focal areas of dense calcification. This appearance is =
typical of=20
            cartilaginous material. High-grade secondary peripheral =
tumor.=20
</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\radio\images\Large\70587058Picture_10.jpg&=
amp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70587058Picture_10.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\radio\images\Large\70587058Picture_10.jpg&=
amp;template=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\radio\images\Large\70587058Picture_10.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 11.=20
            Chondrosarcoma. Lateral radiograph of the distal femur in a =
patient=20
            with hereditary multiple exostoses (same patient as in =
Images=20
            12-13). Several osteochondromas of varying appearances arise =
from=20
            the metaphyseal region; these typically grow away from the =
joint.=20
            Soft tissue calcification is shown overlying the most =
posterior=20
            osteochondroma. High-grade secondary peripheral tumor. =
</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\radio\images\Large\70597059picture_11.jpg&=
amp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70597059picture_11.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\radio\images\Large\70597059picture_11.jpg&=
amp;template=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\radio\images\Large\70597059picture_11.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 12.=20
            Chondrosarcoma. CT scan of the distal femur demonstrates a=20
            broad-based osteochondroma with a thick overlying =
soft-tissue cap=20
            that contains focal calcification. The metaphyseal contour =
is=20
            irregular because of the presence of several other =
osteochondromas=20
            in this patient with hereditary multiple exostoses (same =
patient as=20
            in Images 11 and 13). High-grade secondary peripheral tumor. =
</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\radio\images\Large\70607060Picture_12.jpg&=
amp;template=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/70607060Picture_12.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\radio\images\Large\70607060Picture_12.jpg&=
amp;template=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\radio\images\Large\70607060Picture_12.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
        CT</TD></TR></TBODY></TABLE>
      <TABLE width=3D600 border=3D0>
        <TBODY>
        <TR>
          <TD class=3Dtblstyle colSpan=3D2><STRONG>Caption:</STRONG> =
Picture 13.=20
            Chondrosarcoma. Fast spin-echo T2-weighted axial MRI of the =
distal=20
            femur in a patient with hereditary multiple exostoses (same =
patient=20
            as in Images 11-12). Image demonstrates the thick cartilage =
cap=20
            overlying a broad-based osteochondroma. Areas of focal =
reduced=20
            signal intensity in the cartilage cap correspond to foci of =
dense=20
            calcification. High-grade secondary peripheral tumor. =
</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\radio\images\Large\7061image13.jpg&amp;tem=
plate=3Dizoom2"=20
            target=3D_new><IMG alt=3D"Click to see larger picture"=20
            =
src=3D"http://www.emedicine.com/radio/images/7061image13.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\radio\images\Large\7061image13.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\radio\images\Large\7061image13.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><A name=3Dsection~bibliography>
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background=3D"http://www.emedicine.com/images/ui/bar.gif">&nbsp;</td>=0A=
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Chew, MD, EdM<br>Kyung J Cho, MD<br>Lawrence M Davis, MD<br>Ziv J =
Haskal, MD<br>John Karani, MBBS, FRCR<br>Eugene C Lin, MD<br>James G =
Smirniotopoulos, MD<br>Charles S White, 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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          <td width=3D"137" valign=3D"top" class=3D"tinytext"> Lisa =
Davis, MA<br>Deborah M Eng<br>Beth Lehr<br>Kelly Nikkila<br>Tammy =
Pomernackas<br>Jennifer Welsh<br> </td>=0A=
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Krasny, MD<br></td>=0A=
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Coombs, MBChB, PhD<br>Walter Huda, PhD<br> </td>=0A=
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Abdel-Dayem, MD<br>Zahir Amin, MBBS, MRCP, MD, FRCR<br>Judith K Amorosa, =
MD, FACR<br>Lori Lee Barr, MD<br>Mario Bezzi, MD<br>Orest Boyko, MD, =
PhD<br>Jeffrey C Brandon, MD<br>James C Brown, MD<br>Michael A Bruno, =
MD<br>Jocelyn D Chertoff, MD<br>Harris L Cohen, MD, FACR<br>Peter S =
Conti, MD, PhD<br>Jeffrey L Creasy, MD<br>Pamela J DiPiro, =
MD<br>Amilcare Gentili, MD<br>Charles M Glasier, MD<br>John L Go, =
MD<br>S Bruce Greenberg, MD<br>Giuseppe Guglielmi, MD<br>John L Haddad, =
MD<br>Jacqueline C Hodge, MD<br>Fredric A Hoffer, MD<br>J Randy Jinkins, =
MD<br>Robert A Koenigsberg, DO, MSc, FAOCR<br>Glenn Krinsky, MD<br>Neela =
Lamki, MD<br>Henrique M Lederman, MD, PhD<br>Leon Lenchik, MD<br>David S =
Levey, MD, PhD<br>Lucien M Levy, MD, PhD<br>John M Lewin, MD<br>Jeffrey =
A Miller, MD<br>Hrudaya Nath, MBBS, MD<br>Mahesh R Patel, MD<br>Justin D =
Pearlman, MD, ME, PhD, FACC<br>Steven Perlmutter, MD<br>Hugh J =
Robertson, MD, FACR<br>Pamela W Schaefer, MD<br>Kitt Shaffer, MD, =
PhD<br>Lee Sider, MD, MBA<br>Satinder P=0A=
Singh, MD<br>Gary P Siskin, MD<br>Christopher L Sistrom, MD<br>Robert J =
Starshak, MD<br>Moni Stein, MD<br>Ludwig G Strauss, MD<br>Richard Tello, =
MD<br>Anthony Watkinson, MD<br>Eric P Weinberg, MD<br>Beverly P Wood, =
MD, MS<br>Chi-Shing Zee, MD<br> </td>=0A=
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Azavedo, MD<br>Joshua A Becker, MD<br>Javier Beltran, MD<br>Lawrence M =
Boxt, MD, FACC<br>William G Bradley, Jr, MD, PhD, FACR<br>Kyung J Cho, =
MD<br>Douglas M Coldwell, MD, PhD<br>Abraham H Dachman, MD<br>Robert L =
DeLaPaz, MD<br>Pamela J DiPiro, MD<br>Bruno D Fornage, MD<br>Arnold C =
Friedman, MD, FACR<br>Spencer B Gay, MD<br>John H Harris, Jr, =
MD<br>George Hartnell, MD<br>Marta Hernanz-Schulman, MD, =
FAAP<br>Theodore E Keats, MD<br>Marc S Keller, MD<br>Kieran McHugh, =
MBBCh<br>John D Newell, Jr, MD, FACR, FCCP, FASER<br>David Andrew =
Nicholson, BM, BS, FRCR<br>Wilfred CG Peh, MBBS, MD, FRCPE, FRCPG, =
FRCR<br>C Douglas Phillips, MD<br>Philip W Ralls, MD<br>Michael R Rees, =
BSc, MBChB, FRCP, DMRD, FRCR<br>William R Reinus, MD, MBA, FACR<br>Karen =
L Reuter, MD, FACR<br>Matthew D Rifkin, MD<br>Val Runge, MD<br>Georges M =
Salamon, MD<br>Udo P Schmiedl, MD, PhD<br>Paul M Silverman, MD<br>Lynne =
S Steinbach, MD<br>Robert M Steiner, MD<br>Eric J Stern, MD<br>David A =
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(i=3D0;!x&&i<d.forms.length;i++) x=3Dd.forms[i][n];
  for(i=3D0;!x&&d.layers&&i<d.layers.length;i++) =
x=3DMM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=3Dd.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=3D0,x,a=3DMM_swapImage.arguments; document.MM_sr=3Dnew Array; =
for(i=3D0;i<(a.length-2);i+=3D3)
   if ((x=3DMM_findObj(a[i]))!=3Dnull){document.MM_sr[j++]=3Dx; =
if(!x.oSrc) x.oSrc=3Dx.src; x.src=3Da[i+2];}
}
------=_NextPart_000_0000_01C47D62.4B717410
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.emedicine.com/asp/resize.js

function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init=3D=3Dtrue) with (navigator) {if =
((appName=3D=3D"Netscape")&&(parseInt(appVersion)=3D=3D4)) {
    document.MM_pgW=3DinnerWidth; document.MM_pgH=3DinnerHeight; =
onresize=3DMM_reloadPage; }}
  else if (innerWidth!=3Ddocument.MM_pgW || =
innerHeight!=3Ddocument.MM_pgH) location.reload();
}
MM_reloadPage(true);
------=_NextPart_000_0000_01C47D62.4B717410
Content-Type: application/octet-stream
Content-Transfer-Encoding: 7bit
Content-Location: http://www.emedicine.com/asp/date.js

var months=new Array(13);
months[1]="January";
months[2]="February";
months[3]="March";
months[4]="April";
months[5]="May";
months[6]="June";
months[7]="July";
months[8]="August";
months[9]="September";
months[10]="October";
months[11]="November";
months[12]="December";
var time=new Date();
var lmonth=months[time.getMonth() + 1];
var date=time.getDate();
var year=time.getYear();
if (year < 2000)    
year = year + 1900; 
document.write( lmonth + " ");
document.write(date + ", " + year );

------=_NextPart_000_0000_01C47D62.4B717410
Content-Type: application/octet-stream
Content-Transfer-Encoding: 7bit
Content-Location: http://www.emedicine.com/trigger.js

// Trigger.js 2.0
if (window.Event)
   document.captureEvents(Event.MOUSEUP);
document.onmouseup = display;

------=_NextPart_000_0000_01C47D62.4B717410--

