Medical Definition of Cerebral aneurysm
Cerebral aneurysm: A localized widening of a blood vessel within the brain. An aneurysm is a localized widening (dilatation) of an artery or vein within the brain. At the area of an aneurysm, there is typically a bulge and the wall is weakened and may rupture. The word "aneurysm" comes from the Greek "aneurysma" meaning "a widening."
See: Berry aneurysm.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 5/12/2014
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Medically reviewed by Martin Zipser, MD; Board Certified: Surgery