Left flank pain due to Congenital Pelvi-ureteric junction (PUJ) obstruction, is surgery needed?

Left flank pain due to Congenital PUJ obstruction. Both kidney function are normal. 4 renal scans have been done. Some doctors advice surgery. Some say surgery not needed. Flank pain is frequent and bothersome. My age is 38 years and I am a Male.

Age: 38
Male
Medications: Cresar AM and Tonact