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Partial thickness supraspinatus tears: diagnosis by magnetic resonance arthrography.

Two patients, with clinical symptoms of advanced impingement syndrome, presented for radiologic evaluation. The magnetic resonance (MR) images of each patient were interpreted as representing a full thickness tear of the supraspinatus tendon. Magnetic resonance arthrography was performed on both patients to further determine the extent of the tear. Using this technique, both patients were diagnosed correctly as having partial thickness tears; one on the articular surface and the other on the bursal surface of the tendon. This information is useful in surgical planning and in patient outcome.