SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Kidney stone. False-colour computed tomography (CT) scan showing a normal left kidney and a right kidney (blue and yellow at bottom right) greatly enlarged due to the presence of a kidney stone (yellow). Kidney stones, also known as calculi, are caused by precipitation from solution of the substances in the urine and are mainly formed by calcium oxalate and/or phosphate. Here the kidney is affected by a staghorn calculus which completely fills the pelvic region of the kidney. The obstruction of the urine flow caused by such stones may lead to rapid kidney damage and severe infection known as pyelonephritis. The bony vertebral tissue is seen (white) at bottom centre.
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