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Fig. 1A. —10-year-old HIV-infected boy with left-sided hemiparesis. Multiple ischemic infarctions are located in vascular territories harboring fusiform aneurysms. MR angiogram of proximal intracranial circulation shows aneurysmal dilatation of proximal segment of right anterior and right middle cerebral arteries (long arrows). There is also less prominent dilatation of left posterior cerebral artery (short arrow) and basilar artery.