If stones less than 7mm generally pass through spontaneously without surgical intervention...Stones that are 7 mm and larger are unlikely to pass spontaneously and require some type of surgical procedure, such as the following: Stent placement, Percutaneous nephrostomy, Extracorporeal shockwave lithotripsy, Ureteroscopy, Percutaneous nephrostolithotomy, Open nephrostomy... Consult nearest urologist they will help you further.