Definition: A weak area on the wall of an artery that balloons out, causing the wall to become weaker as it becomes larger. Once an aneurysm reaches a certain size, it has a high risk of bursting and bleeding inside the brain.
Aneurysm
From Jose Vega M.D., Ph.D., former About.com Guide
Updated November 02, 2008
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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