DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Staghorn kidney stone. X-ray of the abdomen of a patient with a staghorn stone (white, upper centre) in the left kidney. Kidney stones, or calculi, form when mineral salts build up and harden inside the kidney. Most stones are small enough to be passed but larger stones can block the flow of urine from the kidney, causing extreme pain. They can by treated non-invasively (broken down by sound waves) or removed by surgery.
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