An abdominal aortic aneurysm is a bulge in the lining of the aorta, the body's main artery from the heart, as it passes through the abdomen. It grows slowly and usually causes no symptoms until it becomes large. An MRI may show changes in the width of the abdominal aorta that could suggest an aneurysm is present. Finding an abdominal aortic aneurysm early opens the door to monitoring and surgical planning well before it reaches a dangerous size.
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