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A 39-year-old woman was admitted to the hospital because of a 2-month history of dizziness, gait disturbance, and left-sided ataxia. There was a past history of hypertension, dyslipidemia, and gastroesophageal reflux. The general physical examination was normal, with a temperature of 37°C, pulse of 84 bpm, and blood pressure of 159/90 mm Hg. Neurologic exam showed a patient who was hypoprosexic and bradylalic and had short-term memory deficit, dyscalculia, and difficulty in obeying complex commands. The pupil reflexes were symmetric, but the right pupil was larger than the left, with right reactive mydriasis. No ptosis or diplopia was found. The remaining cranial nerve responses were normal. Strength in the upper left extremity was graded 4…