DR MOURAD BOUDIAF - ISM / SCIENCE PHOTO LIBRARY DR MOURAD BOUDIAF - ISM / SCIENCE PHOTO LIBRARY
Kidney stones. Coloured computed tomography (CT) scan of a section through the abdomen of a patient with stones (small, white) in both kidneys. Kidney stones are usually formed by the precipitation of the mineral salt calcium oxalate from the urine. The resulting hard, round stones (calculi) may cause severe pain, especially as they pass down the urinary tract. Large stones may need to be surgically removed or broken down using ultrasound therapy.
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