Endoscopic En Bloc Resection of Giant Cell Tumor of Tendon Sheath of Anterior Ankle.

Giant cell tumor of the tendon sheath (GCTTS) originates from the synovial cells of the tendon sheath. It is one of the most common benign soft-tissue tumors of the foot and ankle affecting the joints, bursae, and tendon sheaths and can behave in a locally aggressive manner. Complete surgical resection with long-term follow-up is the preferred treatment. Because GCTTS is a benign condition, the equilibrium between the quality of the surgical margins and functional preservation should be considered. If more aggressive resection is applied, the outcome may negatively affect quality of life, whereas incomplete resection may lead to recurrence. The purpose of this technical note is to describe the details of endoscopic en bloc resection of GCTTS of the anterior ankle. This endoscopic approach can provide a magnified view of the operative site, allowing accurate surgical assessment to ensure complete resection of the lesion without damage to the adjacent normal structures.