Kidney Stones:

Stone Disease (also calculus disease) An abnormal concretion of mineral salts around organic material found especially in hollow organs or ducts. More than one million cases of urinary tract stones are diagnosed each year in the United States. They are the third leading cause of hospitalizations and the seventh leading cause of physician visits in the United States.

For additional information, visit the American Foundation for Urologic Disease site at: http://www.afud.org/conditions/ks.html