GLENOID-LABRAL CYST ENTRAPPING THE SUPRASCAPULAR NERVE - DISSOLUTION AFTER ARTHROSCOPIC DEBRIDEMENT OF AN EXTENDED SLAP LESION

Glenoid labral cysts are commonly associated with labral tears, which can cause pain or instability. We present the case of a patient, refer red for neurological complaints, who was actually suffering from supra spinatus nerve entrapment syndrome. Electroneurogram studies showed an isolated lesion of the branch to the infraspinatus muscle. Magnetic r esonance imaging confirmed a glenoid labral cyst extending from the cr anial glenoid to the scapular notch. After arthroscopic debridement of an extended SLAP-lesion that had caused joint fluid extrusion, the di ssolution of the cyst was associated with complete neurological recove ry. The patient is pain free and range of motion is normal. An attempt at an arthroscopic procedure seems warranted in cases like this, sinc e cysts that accompany labral tears can dissolve after rigorous debrid ement of the torn labrum, much like meniscal cysts. Extended and hazar dous open excisions can thus be avoided.