Lipohyalinosis and miliary microaneurysms causing cerebral hemorrhage in a patient with moyamoya. A clinicopathological study.

Abstract
Moyamoya is an intriguing and controversial syndrome. This patient study serves to align the pathophysiology of intracranial hemorrhage in moyamoya with the cerebral vascular disease seen with hypertension, or aging. The historical evidence linking lipohyalinosis and microaneurysms to cerebral hemorrhage is reviewed; the pathogenesis of this angiopathy is discussed; and explanations considered for its association with the vascular pattern of moyamoya. Hemodynamics and/or genetics are among the primary operant etiologic factors.

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