Persistent ulnar styloid ossicle
A persistent ulnar styloid ossicle is an anatomical variant where the ulna styloid ossification center fails to unite with the ulna.
Seen as a well corticated ossification just adjacent to the ulnar styloid
- os triangulare: a small accessory ossicle located between the ulnar styloid, lunate and triquetrum
- ununited old ulnar styloid fracture
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