When aneurysms bleed, the blood accumulates in the fluid space under the brain and this is called a subarachnoid hemorrhage. Aneurysms that bleed ... Uses magnetic fields to create images of the brain ...

What Is a Brain Aneurysm? A brain aneurysm is a weak spot in the wall of a blood vessel inside the brain that can sometimes burst and cause a subarachnoid hemorrhage. Think of a weak spot in a ...