Giant Cell Tumor of the Flexor Sheath of the Index Finger

Giant cell tumors (GCTs) of the tendon sheath are common benign neoplasms of the hand, arising from the synovial lining of tendon sheaths. We report the case of a 41-year-old man who presented with a painless mass on the right index finger, progressively enlarging over four years. Ultrasound examination revealed a well-circumscribed lesion consistent with a GCT. The patient underwent complete surgical excision without complications. At six-month follow-up, there was no evidence of recurrence. This case highlights the importance of early diagnosis and meticulous surgical management of this pathology.