3D computed tomography (CT) angiogram scan of the abdomen of a patient who has had an aortic aneurysm repaired with a stent (metal mesh, black). The aorta is the body's main artery. An aneurysm is a dilation of the artery wall, and can be fatal if it ruptures. A stent has been implanted in the abdominal region of the aorta above and at the bifurcation of the aorta into the iliac arteries.