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Aortic aneurysm. Coloured X-ray of the chest of a 68 year old woman with an aneurysm of the aortic arch (orange, upper centre). The aorta is the body's main artery. It carries blood from the heart to the rest of the body. An aneurysm is a blood-filled dilation in a blood vessel caused by a weakened vessel wall. If left untreated aneurysm rupture and are often fatal. Treatment is with repair or replacement of the vessel.
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