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What is Aneurysm?

By  ,  National Institute of Health
Jan 06, 2013
4.8 / 5(4 Ratings)

An aneurysm (AN-u-rism) is a balloon-like bulge in an artery. Arteries are blood vessels that carry oxygen-rich blood from your heart 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. The force of blood pushing against the weakened or injured walls can cause an aneurysm.


An aneurysm can grow large and burst (rupture) or cause a dissection. 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 conditions are often fatal.

 

Most aneurysms occur in the aorta—the main artery that carries blood from the heart to the rest of the body. The aorta goes through the chest and abdomen.


An aneurysm that occurs in the part of the aorta that's in the chest is called a thoracic (tho-RAS-ik) aortic aneurysm.

 

An aneurysm that occurs in the part of the aorta that's in the abdomen is called an abdominal aortic aneurysm.


Aneurysms also can occur in other arteries, but these types of aneurysm are less common.


About 14,000 Americans die each year from aortic aneurysms. Most of the deaths result from rupture or dissection.


Early diagnosis and medical treatment can help prevent many cases of rupture and dissection. However, aneurysms can develop and become large before causing any symptoms. Thus, people who are at high risk for aneurysms can benefit from early, routine screening.

 

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