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An aneurysm (AN-u-rism) is a balloon-like bulge in an artery. Arteries are blood vessels that carry oxygen-rich blood to your body. Arteries have thick walls to withstand normal blood pressure.However, certain medical problems, genetic conditions, and trauma can damage or injure artery walls.n aneurysm can grow large and rupture (burst) or dissect. A rupture causes dangerous bleeding inside the body. A dissection is a split in one or more layers of the artery wall. The split causes bleeding into and along the layers of the artery wall. Both rupture and dissection often are fatal.
In this article. An aneurysm is an abnormal bulge in the wall of an artery. Normally, the walls of arteries are thick and muscular, allowing them to withstand a large amount of pressure.Occasionally, however, a weak area develops in the wall of an artery.his allows the pressure within the artery to push outwards, creating a bulge or ballooned area called an aneurysm.. Aneurysms can form in any blood vessel, but they occur most commonly in the aorta (aortic aneurysm). The aorta is the largest artery in the body. It carries blood from the heart to the rest of the body.