Paralabral cyst in spinoglenoid notch causing infraspinatus denervation


Supraspinatus and infraspinatus muscles are supplied by suprascapular nerve. The branch to supraspinatus nerve takes off at the level of suprascapular notch. In this case, isolated denervation changes in infraspinatus muscle suggest that the suprascapular nerve compression has distal to the nerve supply to supraspinatus muscle, probably at the level of spinoglenoid notch. Although the cyst extends to the suprascapular notch, there is no evidence of neural impingement at that site yet.