Abstract
We report a case of intratendinous ganglion arising from the extensor tendon of the ring finger. The patient, a 57-year-old woman, was awared of the mass on the dorsum of the right hand two years ago. She consulted our hospital due to pain and enlargement of the mass. The findings of MRI suggested a ganglion, a giant cell tumor of the tendon sheath, or tenosynovitis. Surgical exploration revealed a gelatinous lobulated mass associated with a tear of the extensor tendon of the ring finger, and this was diagnosed as a ganglion. After 1 year and 4 months of follow-up, neither recurrence not tendon rupture has been observed. Intratendinous ganglion is rare, and to our knowledge only 38 cases have been reported previously. The majority (24 cases) arose from an extensor tendon of the hand, and were located in the distal portion of the extensor retinaculum, suggesting that repeated irritation of this area might give rise to mucoid degeneration. This was likely the case in the present patient in view of her occupation (personal computer user) and the lesion location.
