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A 43-year-old man presented with acute-onset hemianesthesia involving the right arm, the right leg, and the right side of the face. Six weeks earlier, he had a moderate occipital headache that lasted for 3 days. Diffusion-weighted magnetic resonance imaging (MRI) of the brain showed a thalamic lesion of restricted diffusion on the left side (Panel A, arrow), which was consistent with acute posterior choroidal-artery infarction. T2-weighted MRI scans, a magnetic resonance angiogram, and a computed tomographic angiogram (Panels B, C, and D, respectively) revealed a dilatation of the left posterior cerebral artery, with a double lumen — that is, . . . [Full Text of this Article] |
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