Understanding : Brain Aneurysm Basics

Being diagnosed with a brain aneurysm is frightening. Although ruptured aneurysms are relatively uncommon, they represent a very serious illness which is associated with a high rate of mortality and disability. Having survived a ruptured aneurysm is a very difficult experience to have gone through and can be extremely unsettling. Gathering information about your condition can help ease this fear, help begin the healing process, and help bring a sense of comfort and support during a trying time.

What is a brain aneurysm?

Brain AneurysmA brain aneurysm, also referred to as a cerebral aneurysmCerebral Aneurysm
A weak bulging spot on the wall of the brain artery - also called a brain or intracranial aneurysm.
or intracranial aneurysm (IA), is a weak bulging spot on the wall of a brain artery very much like a thin balloon or weak spot on an inner tube. Over time, the blood flow within the artery pounds against the thinned portion of the wall and aneurysms form silently from wear and tear on the arteries. As the artery wall becomes gradually thinner from the dilation, the blood flow causes the weakened wall to swell outward. This pressure may cause the aneurysm to rupture and allow blood to escape into the space around the brain. A ruptured brain aneurysm commonly requires advanced surgical treatment.

What are the two types of aneurysms?

Saccular Aneurysm

A saccular aneurysm is the most common type of aneurysm and account for 80% to 90% of all intracranial aneurysms and are the most common cause of nontraumatic subarachnoid hemorrhage (SAH)Subarachnoid Hemorrhage (SAH)
Bleeding into the space around the brain (the subarachnoid space). This occurs when an aneurysm ruptures, but it may also result from other causes of bleeding around the brain including a head injury from trauma. Subarachnoid hemorrhage from a ruptured cerebral aneurysm can lead to a hemorrhagic stroke, brain damage and death.
. It is also known as a "berry" aneurysm because of its shape. The berry aneurysm looks like a sac or berry forming at the bifuraction  or the "Y" segment of arteries. It has a neck and stem. These small, berry-like projections occur at arterial bifurcations and branches of the large arteries at the base of the brain, known as the Circle of WillisCircle of Willis
Circle of vessels around the base of the brain where most aneurysms are found.
.

The fusiform aneurysmFusiform Aneurysm
An irregular shaped widening of a cerebral vessel that does not have a discrete neck or pouch of the side of a vessel. Fusiform aneurysms may rupture, press on brain stuctures, or cause strokes.
is a less common type of aneurysm. It looks like an outpouching of an arterial wall on both sides of the artery or like a blood vessel that is expanded in all directions. The fusiform aneurysm does not have a stem and it seldom ruptures.