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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.
Medical Definition of ANEURYSM. : an abnormal blood-filled dilatation of a blood vessel and especially an artery resulting from disease of the vessel wall. â anÂ·euÂ·rysÂ·mal also anÂ·euÂ·risÂ·mal \Ëan-yÉ-Ëriz-mÉl\ adjective. â anÂ·euÂ·rysÂ·malÂ·ly \-Ä\ adverb.efinition of ANEURYSM. : an abnormal blood-filled bulge of a blood vessel and especially an artery resulting from weakening (as from disease) of the vessel wall. â anÂ·euÂ·rysÂ·mal \Ëan-yÉ-Ëriz-mÉl\ adjective. anÂ·euÂ·rysm also anÂ·euÂ·rism \Ëan-yÉ-Ëri-zÉm\.