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In rare cases of stroke in children and youths, a likely cause is the idiopathic disease moyamoya, characterized by the slow and progressive stenosis and occlusion of the internal carotid artery and the arteries of the circle of Willis. A result of these stenoses is the formation of collaterals that are typically small and fragile, and liable to rupture. While there is no cure for moyamoya, a variety of surgical procedures can be performed to reestablish and maintain adequate blood supply to the affected brain areas.
The procedures described here include various revascularization techniques and recommended bypasses.