Aortic aneurysms are caused by a weakening of the aortic wall. The aorta is the largest artery in the body and carries blood from the heart to the rest of the body. The wall of the aorta is made up of three layers: the intima, the media, and the adventitia. Aortic aneurysms occur when the media layer of the aorta weakens. This can happen for a number of reasons.
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