50-year-old female with ulnar-sided wrist pain A marker was placed along the ulnar aspect of the wrist. There is thickening and abnormal signal intensity of the extensor carpi ulnaris tendon as it courses along the distal ulna and ulnar aspect of the wrist indicating moderate to severe tendinosis. There is increased signal intensity within the tendon extending to the surface indicating partial thickness tearing. Enhancement of the tendon sheath indicates tenosynovitis. In addition, there is inflammation in the soft tissues surrounding the tendon sheath.Multiple slips of the abductor pollicis longus may reflect a normal variant. A small cleft is present within the extensor carpi radialis just proximal to its insertion which may represent partial thickness tearing, but this may not be of any current clinical significance. The visualized musculature is within normal limits. A lobulated small collection of fluid signal intensity with peripheral enhancement volar to the radioscaphoid articulation, along the distal margin of the radioscaphocapitate ligament, likely represents a ganglion or synovial cyst. The scapholunate and lunotriquetral ligaments are intact. There is mild increased signal intensity and enhancement along the medial fibers of the articular disc of the TFCC at the ulnar styloid; this may be due to mild inflammation or degenerative changes, but we see no discrete tear. Mild synovial enhancement is seen within the carpus suggesting a mild synovitis. A small lobulated focus of abnormal signal intensity within the capitate may represent a degenerative cyst, chronic erosion or ganglion.
Tenosynovitis, tendinosis and partial tearing of the extensor carpi ulnaris with other findings as described above.