ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Coloured renal angiogram (X-ray) of the abdomen of a 54 year old patient, showing a large cyst on the upper part of one kidney (at centre left). A catheter (black tube) feeds dye into the blood vessels. A cyst is a fluid-filled sac that may affect the function of the kidney.
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