Answer:
Giant cell tumors of the tendon sheath are the second most common tumors in the hand. It is not a very good term, since the lesion does not uniformly contain giant cells and is not necessarily associated with the tendon sheath. It usually occurs on the volar surface of the fingers or hand, although dorsal location is not uncommon. There is a propensity for involvement of the radial three digits and the DIP joint. Clinically, it is firm, nodular and nontender, grows slowly, does not transilluminate. Treatment is excision, though the recurrence rate is 5-50% secondary to satellite lesions or incomplete excision.