A 65-Year-Old Man Is Brought to the Emergency Department After

A 65-year-old man is brought to the emergency department after he suddenly became unresponsive at home.  On arrival, paramedics found him pulseless with ventricular fibrillation.  After 10 minutes of cardiopulmonary resuscitation, the patient regains spontaneous circulation.  In the hospital, he is intubated and placed on mechanical ventilation.  His vitals remain stable.  A therapeutic hypothermia protocol is initiated.  After 72 hours following rewarming, he remains comatose with fixed and dilated pupils.  There is no direct or consensual pupillary response to light.  MRI of the brain reveals diffuse loss of grey-white matter differentiation with sulcal effacement.  Damage to which of the following areas of the brain is the most likely cause of this patient's pupillary findings?

A) Medulla
B) Midbrain
C) Occipital lobe
D) Parietal lobe
E) Pons
F) Temporal lobe
G) Thalamus

Correct Answer:

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