A 46-year-old man presented with a 4-year history of decreased left hand strength and burning pain beginning at the elbow and radiating down the ulnar side of the forearm to the hand. His medical history included a motor vehicle accident in 2000. On neurological examination, his left hand and fingers displayed significant muscle atrophy. Flexion and extension of his wrist was preserved; however, he had paresis of lateral wrist movement. He could flex his index finger slightly, but had no independent movement of the other fingers. Sensation to fine touch and pinprick from the inner aspect of his elbow to the medial two fingers was decreased. Strength and sensation in the upper arm were normal.?
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