A 72-Year-Old Man Presented to the Office Complaining of Left

A 72-year-old man presented to the office complaining of left shoulder pain. The patient has been feeling weakness in the left arm for the last month. Physical examination shows left-sided ptosis. The left pupil is smaller in diameter than the right, but both pupils are reactive. Extraocular movements are intact. This patient's symptoms are most likely due to disruption of which of the following structures?

A) Autonomic ganglia
B) Brainstem
C) Cerebral cortex
D) Spinal cord
E) Subcortical grey matter
F) Vagus nerve

Correct Answer:

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