CAMAL, ISM / SCIENCE PHOTO LIBRARY CAMAL, ISM / SCIENCE PHOTO LIBRARY
Kidney cyst. Coloured ultrasound scan of a liquid cyst (dark blue) on a patient's kidney. A cyst is an abnormal, normally liquid-filled sac. This one is benign, but excessive size can place pressure on surrounding organs and interfere with the renal function. Ultrasound scans construct a picture of internal body organs by emitting high-frequency sound waves and detecting the reflections.
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