Arterial stents. Coloured 3-D computed tomography (CT) scan of stents in the abdominal arteries, superimposed on a X-ray of the abdomen. The aorta is the large artery running down the centre. The two renal arteries branch off the aorta to the kidneys, a stent (white) has been placed in the left renal artery (right). The aorta branches into the two iliac arteries, which serve the legs. A stent has been placed into one upper iliac artery (left). A stent is a wire mesh tube used to keep open an artery that had become narrowed. The bands at upper right and left are the ribs, the spine runs down the centre and the pelvis is lower centre.