Glenoid labral cyst: a rare cause of subacromial impingement syndrome. A case-report.

Glenoid labral cyst is a rare cause of subacromial impingement syndrome wel l visualized by magnetic resonance imaging. A tear in the posterior labrum should be looked for routinely as it is a common concomitant abnormality, s uggesting a possible causal link. Subtle glenohumeral instability should al so be looked for. Follow-ups are too short to allow development of a consen sus regarding surgical techniques.