pigmented villonodular synovitis ( RID3641 )
This patient has worsening pain which has been clinically thought to be lateral epicondylitis with no response to physical therapy or steroid injection. He has erosions of his radial head, anterior capitellum and ulnar coronoid. I see that the LUCL is encased (arrow), and there is either invasion or protrusion into the FDP, FDS, Anconeus and Supinatur muscle. The FDP infiltration is close to the ulnar nerve, which appears unremarkable. XRs are normal. [ Article ]
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