Abdominal aortic aneurysm is a localized dilatation (ballooning) of the abdominal aorta exceeding the normal diameter by more than 50 percent. Approximately 90 percent of abdominal aortic aneurysms occur infrarenally (below the kidneys), but they can also occur pararenally (at the level of the kidneys) or suprarenally (above the kidneys). Such aneurysms can extend to include one or both of the iliac arteries in the pelvis.
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