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A brain aneurysm (AN-yoo-riz-um) is a bulge or ballooning in a blood vessel in the brain. It often looks like a berry hanging on a stem.A brain aneurysm can leak or rupture, causing bleeding into the brain (hemorrhagic stroke).Most often a ruptured brain aneurysm occurs in the space between the brain and the thin tissues covering the brain.This type of hemorrhagic stroke is called a subarachnoid hemorrhage. A ruptured aneurysm quickly becomes life-threatening and requires prompt medical treatment. brain aneurysm (AN-yoo-riz-um) is a bulge or ballooning in a blood vessel in the brain. It often looks like a berry hanging on a stem.
Brain Aneurysm Repair. Brain aneurysm repair is a surgical procedure used to treat a bulging blood vessel in the brain that is at risk of rupturing or tearing open. An aneurysm occurs when the wall of a blood vessel becomes thin and bulges or balloons out.Many aneurysms remain undetected because they often produce no symptoms until they rupture. This is a serious medical problem that, left untreated, could lead to stroke or brain damage.nderstanding the Basics of Brain Aneurysms. When a blood vessel is weakened or becomes thin, it risks tearing open or rupturing. This weakened or bulging vessel could rupture at any time. If a blood vessel in your brain ruptures, it would cause bleeding in the brain or stroke.