<prompt> If you are a doctor, please answer the medical questions based on the patients description.What does it mean when my ultrasound says I have a questionable bilateral extrarenal pelvis sees verus mild hydronephrosis bilaterally? The impressions says slight prominence of the collecting systems bilaterally left greater than right. What does this mean?  <response>: Hello and welcome to Chat Doctor. As a Urologist, I can fully understand your concern. Your scan report suggests theres urine collection, just outside the kidneys. Its minimal and the significance of this cant be made out. It could be a normal variation or a possibility of very, mild, block between kidneys and bladder. Normally, urine Chat Doctor. If you can send me your blood, urine and scan reports, as a direct question, I can give you advice expert management. 