Kidney Pain after pyeloplasty and removal of stent

My son had a pyeloplasty nearly two months ago to correct a UPJ obstruction and severe hydronephrosis.  Since the surgery he has complained of flank pain.  We were told by the urologist that once the stent was removed that the pain and inflammation should subside.  While the stent was still in, i had taken my son to the ED for severe pain 5 times, it actually mimicked the pain that he had pre-op.  The stent was removed 5 days ago and he has since had kidney pain.  He is on pain medication to deal with the severe pain.  Last night we once again ended up in the Emerency Room.  The urinalysis and blood work showed no infection or abnormality.  He also had an ultrasound and the kidney has decreased in size.  So, with no infection present and kidney function is actually improving, what could be causing the severe pain?  He is only six years old and it kills me to have to see him go thru this

[jsom]

Hi! I know the pain and the frustration you are experiencing.  My son (5) had the laproscopic pyeloplasty Oct 2011.  The nephrostent was pulled a week and a half later and within hours he was having symptoms of obstruction just like before surgery.  We went into the urologists office the next morning and an ultrasound showed his kidney was huge again.  They placed a stent that same day and we went home.  Even with the stent he was experiencing stomach pain on and off.  They removed the stent the last week of Dec. 2011 and once again he was showing signs of obstruction by the next day.  The next day an ultrasound showed his kidney was huge again to they placed a nephrostomy tube in his back to relieve his symptoms until we were able to discuss with the urologist on what action to take next.  When we met with the urologist he deceided to do the open pyeloplasty to get a better open visual picture of the obstructed area.  He had the open pyeloplasty Jan 2012 and we are almost two weeks out.  Two days ago we had a nephrostogram and none of the dye went thru his ureter.  So we are waiting to see if the swelling go down from sugery and hopefully the ureter opens and works.  I would like to hear more about your story and any other steps you have taken since Nov. 2011.  I have been researching non-stop to see other ways to help relieve his obstruction without more surgeries.  I truly sympathize with you since I know what an emotional roller coaster this whole process is when your part of the % that has problems.  Looking forward to hearing from you!