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Staghorn renal stone

Staghorn renal stone with chronic pyelonephritis.The kidney is enlarged and heavy. The capsule is adherent to the cortex and has irregular scars on the surface. Sectioned surface shows dilated pelvicalyceal system with atrophied and thin peripheral cortex. The pelvis of the kidney contains a single, large, sof t yellow white stone t aking the contour of the pelvi-calyceal system (arrow).