UCSF stroke neurologist Dr. Anirudh Sreekrishnan and UCSF vascular neurosurgeon Dr. Luis Savastano describe Moyamoya disease, a rare condition where arteries at the base of the brain become narrowed or blocked, reducing blood flow. The name "moyamoya" means "puff of smoke" in Japanese, describing the tiny vessels that form to compensate. These fragile vessels can cause strokes or bleeding. Treatment often involves surgical procedures, such as direct or indirect revascularization, to restore blood flow and reduce stroke risk. (#41036)