Admission of the patient to the hospital where a routine preoperative control is conducted including: routine hematological and biochemical laboratory parameters (Hct, Hb, WBC, PLT, fasting glucose, urea, creatinine, serum electrolytes, SGOT, SGPT), chest X-ray and anesthesiological preoperative evaluation. Patient is randomized to be treated with one of the 3 endourological operations.