Hi Doctor(s) I have a mild lower back pain at left side and went for ultrasound abdomen scan and the report says 9mm calculi found at left pelvi ureteric junction. Then I understand because of that I'm suffering with pain and I started drinking 4 liters of liquid per day. Can it pass through the fluids? or any surgery required for removing stone? If it is a surgery then should I go with ureteroscopy or shockwave? Please kindly suggest.