ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Renal angioplasty. Coloured X-ray angiogram of a balloon catheter (pink line, left) in the right renal artery of a 57-year-old patient. The blood vessel running top to bottom on the right is the aorta, the main artery of the body, which starts at the heart. It branches into the two renal arteries that serve the kidneys. The balloon catheter is used to treat stenosis (narrowing) of the artery. It was inflated to open the artery and has now been deflated as normal blood flow has been restored. The most common cause of stenosis is atheroma, fatty deposits that thicken the inner coat of the arteries.
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