Anterior inferior cerebellar artery

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Anterior inferior cerebellar artery

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USMLE® Step 1 style questions USMLE

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A 76-year-old woman comes to the emergency department because of severe dizziness with nausea and vomiting beginning two hours ago. She describes double vision and a room-spinning sensation. Her past medical history includes atrial fibrillation, hypertension, hyperlipidemia, and diabetes mellitus type II. Physical examination shows constriction of the left pupil with mild ptosis of the left eyelid and sweating noted on the right side of her face only. Neurologic examination shows a decreased corneal reflex, total paralysis of the left side of her face, decreased hearing on the left, and decreased pain and temperature sensation on the left side of her face and right side of her body; she has normal sensation to light touch and normal strength of her extremities. Finger-to-nose and heel-to-shin testing shows mild ataxia and dysmetria of the left arm and leg. Which of the following arteries is most likely to be involved?