Aortic aneurysm. Computed tomography (CT) scan of an axial section through the abdomen of a patient with a large aneurysm of the abdominal aorta. The front of the body is at top. An aneurysm occurs when an artery wall weakens and swells like a balloon. If it bursts, an aneurysm can cause severe internal haemorrhage (bleeding) and, if left untreated, death.
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