“…They concluded that children with unilateral obstructive hydronephrosis and good initial function are better served by early pyeloplasty than observation [14]. A recently published paper revealed that irrespective of initial DRF, early pyeloplasties lead to an improvement of DRF in prenatal-diagnosed hydronephrosis, while delayed pyeloplasty lead to a marginal, but significant, loss [15].…”