Giant Cell Tumor of Tendon Sheath of the Distal Phalanx.

Giant cell tumor of tendon sheath (GCTTS) is a benign proliferative disorder of the synovial joints and tendon sheaths that typically manifests as a painless, firm, localized, and slow-growing mass. Commonly seen among women in the third to fifth decades, GCTTS can be diagnosed clinically; however, histopathological confirmation is required. The tumor is primarily removed surgically. Recurrence after excision is possible and occurs in up to 45% of cases.