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Parosteal osteosarcoma

Patterson RAP - MedPix

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Affiliation: Uniformed Services University

ABSTRACT

Diagnosis: Parosteal osteosarcoma

History: 24 y/o male with right posterior knee mass

Findings: Radiographs: Large mass with well defined margins emanating from posterior cortex of the distal right femur. Radiolucent line, visible on the lateral radiograph separates tumor from cortex . MRI: Posterior cortical surface distal femoral diaphysis mass, 7.3cm x 6.7cm x 8.3cm, with heterogeneous signal intensity. On T1-weighted MR image shows a heterogenously low signal intensity mass signal. T2-weighted MR image shows a well-defined parosteal mass juxtaposed to the cortex with heterogenous high signal intensity mass posterior to it. T2 post gadolinium study shows low signal intensity in posterior mass correlating with high signal intensity region on T2 image consistent with necrosis. Ossification center at base of mass adjacent to cortical bone. No popliteal vessel invasion, no adjacent soft tissue invasion. No femoral distant metastasis.

Ddx: Parosteal osteosarcoma, juxtacortical myositis ossificans, sessile osteochondroma, periosteal osteosarcoma

Dxhow: Confirmed by biopsy

Exam: Firm, tender mass of the posterior right knee. Normal CBC, Metabolic Panel, and liver enzymes.

No MeSH data available.


Lateral radiograph shows a large mass with well defined borders ossified emanating from posterior cortex of the distal right femur.  Radiolucent line of tumor separation from cortex visible.
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MPX1825_synpic24339: Lateral radiograph shows a large mass with well defined borders ossified emanating from posterior cortex of the distal right femur. Radiolucent line of tumor separation from cortex visible.


Parosteal osteosarcoma

Patterson RAP - MedPix

Lateral radiograph shows a large mass with well defined borders ossified emanating from posterior cortex of the distal right femur.  Radiolucent line of tumor separation from cortex visible.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=MPX1825&req=5

MPX1825_synpic24339: Lateral radiograph shows a large mass with well defined borders ossified emanating from posterior cortex of the distal right femur. Radiolucent line of tumor separation from cortex visible.

View Article: MedPix Image - MedPix Case

Affiliation: Uniformed Services University

ABSTRACT

Diagnosis: Parosteal osteosarcoma

History: 24 y/o male with right posterior knee mass

Findings: Radiographs: Large mass with well defined margins emanating from posterior cortex of the distal right femur. Radiolucent line, visible on the lateral radiograph separates tumor from cortex . MRI: Posterior cortical surface distal femoral diaphysis mass, 7.3cm x 6.7cm x 8.3cm, with heterogeneous signal intensity. On T1-weighted MR image shows a heterogenously low signal intensity mass signal. T2-weighted MR image shows a well-defined parosteal mass juxtaposed to the cortex with heterogenous high signal intensity mass posterior to it. T2 post gadolinium study shows low signal intensity in posterior mass correlating with high signal intensity region on T2 image consistent with necrosis. Ossification center at base of mass adjacent to cortical bone. No popliteal vessel invasion, no adjacent soft tissue invasion. No femoral distant metastasis.

Ddx: Parosteal osteosarcoma, juxtacortical myositis ossificans, sessile osteochondroma, periosteal osteosarcoma

Dxhow: Confirmed by biopsy

Exam: Firm, tender mass of the posterior right knee. Normal CBC, Metabolic Panel, and liver enzymes.

No MeSH data available.