What is a brain aneurysm?
A brain aneurysm is a bulge or ballooning out of a blood vessel in the brain, most often resembling a berry (they are also termed berry aneurysms or cerebral aneurysms). Unfortunately, the walls of the aneurysm are not as stable as normal blood vessel walls. Consequently, brain aneurysms under certain conditions may rupture and allow blood to leak into surrounding tissues. Ruptured aneurysms are medical emergencies; patients with suspected ruptured aneurysms should be seen immediately in emergency departments that have neurosurgeons on call (usually hospitals that handle major trauma have neurosurgeons on call).
What are the different kinds of brain aneurysms?
There are two main types of brain aneurysms -- saccular (berry) aneurysms and fusiform aneurysms. The most common type of aneurysm is saccular. Saccular or berry aneurysms look like a sack and are usually formed at the bifurcation or “Y” formation when a larger vessel splits into two vessels. These types of aneurysms are often found at the branches of larger arteries at the base of brain but may be found in other areas of the brain, too.
The second type, a fusiform aneurysm, is less common than a saccular aneurysm and is more stable and seldom ruptures. Fusiform aneurysms occur at the junction of the “Y” formation where a blood vessel branches and extends into both smaller vessels and also into the single larger vessel. Fusiform aneurysms don't develop any stems like saccular aneurysms.
Medically Reviewed by a Doctor on 10/3/2016
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