A 35-year-old man was admitted to our hospital because of right hemiparesis. His initial National Institutes of Health Stroke Scale score was 8. He had a 1-week history of fever and headache that had occurred approximately 1 month prior to admission. Diffusion-weighted imaging on admission showed hyperintensities in the left putamen and corona radiata (Supplementary Fig. 1). There were no atherosclerotic changes or findings suggesting intracranial arterial dissection or carotid artery disease on magnetic resonance (MR) angiography.

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