A 41 -year-old man who was a heavy machine operator presented with a history of sudden-onset right shoulder pain at rest and profound weakness on right shoulder abduction 1.5 years earlier. The pain was 10 in intensity (0, no pain; 10, worst pain) at onset, remaining at that level for approximately 2 weeks and then gradually improving. At presentation, the patient reported pain intensity of 0 at rest and 7 on arm abduction and external rotation. The weakness had also gradually improved from 70% dysfunction at onset to 40% dysfunction at presentation.
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