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  An aortic aneurysm is a balloon-like bulge in the aorta, the large artery that carries blood from the heart through the chest and torso.

This image shows a normal aorta, and next to it shows a thoracic aortic aneurysm. It also shows an abdominal aortic aneurysm that is located below the arteries that supply blood to the kidneys.
On the right, Figure A shows a normal aorta. Figure B shows a thoracic aortic aneurysm located behind the heart. Figure C shows an abdominal aortic aneurysm located below the arteries that supply blood to the kidneys. (Image courtesy of the National Heart, Lung, and Blood Institute...

 

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