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(a)–(c) The panel shows fat-suppressed proton density weighted axial sections through the distal left arm (proximal to distal). There is thickening of the ulnar nerve (arrows). The swollen nerve fascicles appear hyperintense and are surrounded by the thickened hypointense perineurium and epineurium. A ‘horse-shoe’ shaped perineural collection is noted between the nerve and the triceps muscle (thick arrow).
