Abstract
A previously healthy 17-year-old boy presented with a 1month history of headache and vomiting and worsening scholastic performance. These symptoms worsened over the 2 weeks prior to admission, with accompanying visual obscurations and excessive drowsiness. There was no history of seizures or other focal neurological deficits. There was no other significant past medical history. His general examination was normal. There were no neurocutaneous markers. A poor attention span precluded proper cognitive assessment. His fundus examination revealed papilledema. The rest of his cranial nerve examination was normal. There were no motor or sensory deficits. There were no signs of meningeal irritation. He was evaluated with a plain and contrast-enhanced MRI (Figs. 1 and 2) with diffusion-weighted and apparent diffusion coefficient sequences (Fig. 3).
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