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Complete short segment longitudinal tear of the distal (extensor carpi ulnaris) ECU tendon , which appears undisplaced in the ulnar bony groove under the overlying extensor retinaculum. The tendon sheath and subsheath appear fragmented and edematous with fluid surrounding the tendon . There is evidence of soft tissue edema at ulnar side of wrist with minimal edema at outer fibres of ulnomeniscal homologue. No obvious subluxation of tendon within its sheath or in relation to the ulnar bony groove.
These constellation of findings are consistent with longitudinal tear of ECU with chronic tendinosis in concert with mild tenosynovitis