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A 77-year-old man with a left brachial zoster-associated plexopathy. A, Sagittal inversion recovery image demonstrates increased T2 signal in the upper trunk (arrow) compared with the other elements of the plexus (arrowhead). B, Prolonged T2 is noted in the supraspinatus and infraspinatus (arrows), corresponding to denervation resulting from the plexopathy.
