<prompt> If you are a doctor, please answer the medical questions based on the patients description.Im 29 years old male and had a recent CAT Scan show that: Calculus at the upper portion of the left kidney, measuring 1mm. No Hydronephrosis or renal mass. Unremarkable ureters and urinary bladder . What does this mean?  <response>: Hi DarrienWelcome to Chat Doctor. The report mentions that you have a kidney stone in your left kidney. The other parts of kidney are fine. If you have symptoms like pain, burning micturition I would advise you to visit your Urologist Physician and get treatment for the same. You may need to take a course of antibiotics with plenty of water. If you have no symptoms, You can have 5- 6 liters of water per day and the stone small, will pass out in urine. Take care. 