History A 43-year-old male patient with no known past medical history presented to the emergency department with new-onset bitemporal headache, dizziness, and bilateral lower extremity weakness for 1 day. The patient denied chest pain, shortness of breath, cough, or recent exposure to sick individuals. He was not on any medications and denied alcohol or illicit drug use. Vital signs were unremarkable. Physical examination was notable for a left-sided pronator drift and bilateral dysmetria that was more pronounced on the left. Results of routine laboratory workup, including complete blood count, metabolic panel, and high-sensitivity troponin level, were normal. An electrocardiogram revealed sinus tachycardia with a heart rate of 102 beats per minute, T-wave inversions in the inferior leads, left axis deviation, incomplete right bundle branch block, and frequent premature ventricular contractions. A radiograph of the chest was unremarkable. CT of the head without contrast enhancement demonstrated no acute intracranial abnormities. MRI of the brain without contrast enhancement revealed multiple acute infarcts involving left posterior inferior cerebellar artery distribution, right cere
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