A disorder characterized by the formation of crystals in the pelvis of the kidney.
A kidney stone is a solid piece of material that forms in the kidney from substances in the urine. It may be as small as a grain of sand or as large as a pearl. Most kidney stones pass out of the body without help from a doctor. But sometimes a stone will not go away. It may get stuck in the urinary tract, block the flow of urine and cause great pain. The following may be signs of kidney stones that need a doctor's help:
extreme pain in your back or side that will not go away
blood in your urine
fever and chills
urine that smells bad or looks cloudy
a burning feeling when you urinate
nih: national institute of diabetes and digestive and kidney diseases
Crystals in the pelvis of the kidney.
Stones in the kidney, usually formed in the urine-collecting area of the kidney (kidney pelvis). Their sizes vary and most contains calcium oxalate.