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Cerebral arterial vasculitis identified on DSA. A 45-year-old woman who presented with sulcal SAH (arrow) isolated to the left Sylvian fissure (A). A CTA at the time of admission demonstrated multifocal arterial narrowing (arrowheads) within the bilateral anterior and middle cerebral arteries (B). DSA identified more extensive bilateral arterial irregularity with multifocal narrowing and dilation that was consistent with vasculitis.
