CT carpal boss
Painful swelling at the back of the hand in the middle fingers.
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CT right hand-wrist
Sagittal reformation shows the carpal boss in profile with osteophytic spurs, intraosseous ganglia and small erosions of the articular surfaces developing at the dorsal aspect of the base of the 3rd metacarpal and at the capitate. Ther’s subtle narrowing of 3rd carpometacarpal joint spaces and subchondral sclerosis.
The carpal boss is an osseous protuberance at the level of the dorsal base of the second or third metacarpal. There are various etiologies including trauma, os styloideum, osteophyte formation and partial bone coalition. Carpometacarpal arthrodesis is an option for failure of other treatment.