[Tendinous sheath fibroma causing "trigger wrist" and carpal tunnel syndrome].

There are few cases described of fibroma of tendon sheath located to the hand and the wrist. A case of fibroma of tendon sheath of lumbrical muscle of the index finger has been described. The tumor was responsible of a peculiar phenomenon of "triggering" of the wrist during the movements of flexion and extension of the index finger, and caused compression of the median nerve at the carpal tunnel. The intervention has brought to an early and long lasting relief of symptoms. Moreover, the histological aspect has been described and the relatively high possibility of recurrence of this lesion is underlined.