Infraspinatus atrophy

Ultrasound (US) image of infraspinatus atrophy due to suprascapular nerve compression from a spinoglenoid notch cyst. The video begins with a short-axis image over the teres minor muscle. The US transducer is then glided cephalad over the infraspinatus muscle. The infraspinatus muscle is hyperechoic, granular, and small (atrophic) compared to the teres minor.