Stones in the KIDNEY, usually formed in the urine-collecting area of the kidney (KIDNEY PELVIS). Their sizes vary and most contains CALCIUM OXALATE.

Synonyms: Kidney Stones, Renal Calculus, Stones, Kidney, Calculi, Renal, Stone, Kidney, Kidney Calculus, Calculus, Kidney, Renal Calculi, Calculus, Renal, Kidney Calculi, Kidney Stone, Calculi, Kidney, Nephrolith