Abdominal aortic aneurysm (also known as AAA, pronounced "triple-a") is a localized dilatation of the abdominal aorta exceeding the normal diameter by more than 50 percent. It is caused by degeneration of the aortic wall, but the exact etiology remains unknown.
When the artery that supplies the stomach and the liver forms a bulge that ruptures, this medical emergency results in the deaths of 50 percent of patients before they reach the hospital.
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