<s>[INST] I had a kidney stone . I had cystoscopy and laser removal with placement of a stent on Nov. 15th. My initial six-week ultrasound after surgery showed some hydronephrosis . Because I was still experiencing pain, I had a CT scan with dye done. The swelling has gone down, but I am still experiencing pain. THe urologist said I need to see my general practitioner. [/INST] Hi,Thanks for writing in.You have got your kidney stone treated by laser and subsequent stent placement.It is natural for the 6 week ultrasound to show some residual hydronephrosis if your stone was big and present for some time. You did the right thing in getting CT scan abdomen with contrast done. I suppose the hydronephrosis as seen on CT scan has improved from before.Since nothing is mentioned about removal of stent, I consider it is still in place. Your persisting pain might be due the upper portion of the stent touching the renal pelvis and upper part of ureter. It can also be due to some small infection.Routine urine examination for red blood cells and urine culture and sensitivity may be done for further treatment by your doctor.Hope this helps. </s>