What is an aneurysm?

An aneurysm is a weakening in the wall of the artery which leads to an abnormal bulge (balloon) in the vessel. The most common location is the abdominal aorta, which is the main blood vessel in the abdomen behind where the belly button is located. Aneurysms can also be found in the thoracic aorta (main blood vessel in the chest) as well as the peripheral arteries (arteries in the legs and arms).
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