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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.
Cerebral aneurysm is an outpouching of the wall of a cerebral artery that results from weakening of the wall of the vessel. It is difficult to determine the frequency of cerebral aneurysms because of differences in the definitions of the size of aneurysm and the ways that aneurysms are detected.erebral aneurysm is an outpouching of the wall of a cerebral artery that results from weakening of the wall of the vessel. It is difficult to determine the frequency of cerebral aneurysms because of differences in the definitions of the size of aneurysm and the ways that aneurysms are detected.