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Giant Cell Tumor of Tendon Sheath

History: Male with foot mass.  This is a nice example of a giant cell tumor of tendon sheath, which essentially is a benign proliferation of synovium within the tendon sheath. Giant cell tumors of tendon sheath (GCTTS) are the second most common benign tumors in the fingers after ganglion cysts. On MRI as shown above, … Continue reading