Ischemic stroke Quiz: Ace Your Exams

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A 22-year-old man is brought into the emergency department by emergency medical services after being found face down on the sidewalk. The patient has a temperature of 36°C (96.8°F), pulse of 62/min and regular, blood pressure of 102/72 mmHg and respiratory rate of 7/min, and O2 saturation of 75% on room air. He is stuporous, and pupils are pinpoint. He is subsequently given naloxone. Repeat vital signs are temperature of 36°C (96.8°F), pulse of 72/min, blood pressure of 107/71 mmHg and respiratory rate of 14/min, and O2 saturation of 95% on room air. The patient remains stuporous following administration of this medication. The patient is subsequently intubated and admitted to the intensive care unit, and an MRI of the head reveals the following image:


Reproduced from: Radiopaedia  

Which of the following is the most likely etiology of this patient’s clinical condition?  

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