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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.
An aneurysm is a weak area in a blood vessel that usually enlarges. Itâs often described as a âballooningâ of the blood vessel. Watch an animation (opens in new window). About 1.5 to 5 percent of the general population has or will develop a cerebral aneurysm. About 3 to 5 million people in the United States have cerebral aneurysms, but most are not producing any symptoms. Between 0.5 and 3 percent of people with a brain aneurysm may suffer from bleeding.