Endoscopic Approach for the Excision of Giant Cell Tumor of Tendon Sheath Involving the Hindfoot: A Case Report.

Giant cell tumor of tendon sheath (GCT-TS) is an often benign neoplasm that is relatively uncommon in the foot and ankle when compared to the upper extremities. Magnetic resonance imaging aids in characterizing the lesion, but diagnosis is confirmed with biopsy. Surgical excision is the preferred treatment. There is a lack of studies examining the long-term outcomes of endoscopic excision of GCT-TS, especially lesions found in the foot and ankle. The present study describes a case of a 42-year-old male with GCT-TS of the hindfoot treated with an endoscopic excision through a sinus tarsi approach. The patient was asymptomatic with no local signs of recurrence at the 67-month follow-up visit.