Many dissolved minerals and salts can be found in urine. Stones can form when your urine contains excessive levels of certain minerals and salts. Kidney stones can start out small but develop in size over time, eventually filling the kidney's interior hollow structures. Some stones remain in the kidney and are unaffected. A kidney stone can sometimes pass through the ureter, the tube that connects the kidney with the bladder. Please contact us for additional information! 8130131982.