Giant cell tumor of tendon sheath

Discussion:

Soft-tissue mass arising from the flexor tendon sheath at the level of the 5th proximal interphalangeal joint and inducing bony scalloping. The major differential diagnosis would be between giant cell tumor of tendon sheath and synovial sarcoma. Subsequent MRI (not currently available for upload) confirmed the findings and revealed hemosiderin staining of the mass most consistent with giant cell tumor of tendon sheath.  

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