What is indication for surgery UPJ stenosis?

Peds pt dx w/normal creatinine (could be normal due to compensation/mild stenosis/megaureter, then after surgery do nuclear scan for dx and F/U) If normal kidney (no surgery, just F/U for 1 year and after 1 year repeat test if no change no surgery if change go for surgery) If we find a stone or pt is symptomatic pain indication for surgery