Fig. 5
From: Nerve entrapment syndromes of the upper limb: a pictorial review
49-year-old male with right upper limb weakness. Sagittal PD (a) shows moderate-severe fatty atrophy of the supraspinatus (white arrow) and infraspinatus muscles (blue arrow) which is compatible with suprascapular nerve entrapment. Interestingly, the site of the impingement is not in the typical suprascapular groove, but more proximally, secondary to ossification along the coracoclavicular ligament which is seen on sagittal CT (b, yellow arrow). The patient had a history of acromioclavicular sprain. Consecutive axial PD images (c, d) show that the ossification (c, yellow arrow) contacted and displaced the suprascapular vessels and nerve (c, d, orange arrows) posteromedially, stretching the nerve