Brain Aneurysm, causes, symptoms, risk factors, complications, treatment, stats, and diagnosis

What Is a Brain Aneurysm? A brain aneurysm, also known as a subarachnoid hemorrhage (SAH), Other names: Cerebral aneurysm, brain aneurism, brain aneurysm, cerebral aneurism, is a weak spot in the wall of a blood vessel inside the brain. Think of a weak spot in a balloon and how it feels stretched out and thin. A brain aneurysm is like that.