Fig. 21.

A, Stretch Injury to right sided brachial plexus. Coronal 3D STIR SPACE (A) image shows diffusely enlarged right sided brachial plexus (large arrows) following a recent clavicular fixation for fracture. Notice normal left brachial plexus (small arrows). The patient improved over a few months of expectant treatment. B and C, Stretch injury of the C6 nerve root and musculocutaneous nerve. A 60-year-old man with weakness of the right biceps and brachialis muscles following a recent injury. Axial T2 SPAIR (B) image through the proximal right arm shows an abnormally hyperintense and enlarged musculocutaneous nerve (large arrow) with denervation changes in the biceps and brachialis muscles (small arrows).