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Brain aneurysm

A brain (cerebral) aneurysm is a bulging, weak area in the wall of an artery that supplies blood to the brain. In some cases, a brain aneurysm may cause no symptoms and go unnoticed. In other cases, the brain aneurysm ruptures. This releases blood into the skull and causes a stroke.

When a brain aneurysm ruptures, the result is called a subarachnoid hemorrhage. Depending on the severity of the hemorrhage, brain damage or death may result.

The most common location for brain aneurysms is in the network of blood vessels at the base of the brain called the circle of Willis.

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