what is a brain aneurysm
A brain aneurysm is an abnormal bulge or ballooning in the wall of an artery in the brain. They are sometimes called berry aneurysms because they are often the size of a small berry. Most brain aneurysms produce no symptoms until they become large, begin to leak blood, or burst. If a brain aneurysm presses on nerves in your brain, it can cause signs and symptoms.