Dorsoulnar Wrist Ganglion Associated With an Os Ulnostyloideum: A Case Report

Abstract not available. Introduction provided instead.

True accessory ossifications of the ulnar wrist, unrelated to prior trauma, are uncommon.¹ In a study of 800 asymptomatic wrists, Biyani and colleagues² found only 2 cases of an accessory os styloideum, or “os ulnostyloideum.” Accessory ossicles in the immediate area surrounding the distal ulna and its styloid process have been implicated in primary chronic polyarthritis and inflammation.^1,3

Wrist ganglions are typically found on the dorsal or volar aspect of the wrist. Ulnar-sided dorsal ganglions are less common and, when present, usually arise from the scapholunate joint and spread ulnarly. To our knowledge, ulnar-sided ganglion cysts have not been described in relation to accessory ossifications of the ulnar styloid.