Isolated Spinal Accessory Mononeuropathy Associated With Neurogenic Muscle Hypertrophy: Restricted Neuralgic Amyotrophy or Stretch-Palsy? A Case Report

A 55-year-old man developed transient bi-brachial paresthesias followed by severe pain over his left shoulder ridge and periscapular region within 8 hours of rigorous hand-over-hand hoisting of a 33.8-kg (75-lb) object. He experienced weakness in shoulder abduction followed several weeks later by focal hypertrophy of the left trapezius. Electrophysiologic studies showed significant spontaneous motor activity in the form of denervation …