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Review Question - QID 211729

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QID 211729 (Type "211729" in App Search)
A 63-year-old male undergoes a C4-C7 posterior fusion and laminectomy secondary to significant spinal cord stenosis. Pre-operative examination reveals neck pain, spasticity signs, and finger clumsiness. Post-operative day one, he complains of significant weakness with raising his left arm overhead and on further examination, you notice a clear sensation deficit over the lateral shoulder. What is the most commonly affected structure?