Monday, July 18th, 2011
A solid concretion, varying in size and shape, formed in the kidneys from minerals in the urine; stones composed of calcium are the most common. A stone may stay in the kidney or pass out in the urine stream, often without notice. If a stone is large enough, it can block the flow of urine, causing great pain; a stone that obstructs the flow for a long period of time can cause damage to the kidney. A stone with jagged edges can cause scarring of the kidney.
