| Summary: | Tenosynovial giant cell tumor (TSGCT) is a benign, solitary soft-tissue mass which is derived from synovial cells of the tendon sheath. Foot and ankle related lesions are less commonly observed as compared to the upper extremity related lesions. We report a case which is a localized type of tenosynovial giant cell tumor (L-TSGCT) in the sinus tarsi and originated from the peroneal tendon. Generally, L-TSGCT does not harm the osteochondral structures. However, it caused cortical damage on the calcaneal bone in our case. Although recurrence is the most popular complication after excisional surgery, we have not detected that for a 20-month follow-up.Level of Clinical Evidence: IV
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