Synovial sarcoma with lung metastases

Discussion:

Biopsy of the intra-articular knee lesion showed synovial sarcoma. The finding of a soft tissue mass with calcification close to a joint in a young patient should strongly suggest this diagnosis. 5-10% are intra-articular. Pigmented villonodular synovitis (PVNS) was considered in the differential in this case, but this is not correct as PVNS does not calcify.

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