question: hi my name is suresh from kathmandu. my son is 3 months old. his weight is 6.5kg. recently i have done USG. the report shows that the size of R kidney is 6.2cm and L is 8.7cm. left kidney is grossly hydronephrotic with a thin cortical shell of 4mm. the renal pelvis is dilated. the upper ureter is not dilated, so what is the solution