What Do You Look For On A Ct Scan Of

what do you look for on a ct scan of the abdomen and pelvis to know if you should be worried? I am hurting in my left groin area, have burning when urinating and heavy pressure in my lung area in my back, they think it might be kidney stones but I am not hurting and they say it is not a urinary tract infection because urine is clear I used to have them really bad, so assumed that was what is was