Abstract
Prenatal ultrasonography has revolutionized the approach of congenital anomalies of genitourinary tract. Detection of asymptomatic hydronephrosis during perinatal periods has raised new questions with regard to the need of management and the indications for surgical interventions. Most popular indications for pyeloplasty include high grade (SFU-grade 3 and 4) hydronephrosis on ultrasonography and/or obstructive washout pattern on diuretic renography or decrease of renal function. There still remains controversy whether or not pyeloplasty improves long-term renal function. Our surgical results on asymptomatic hydronephrosis suggest that, although pyeloplasty decreases ultrasonographic dilatation of hydronephrosis and improves excretory pattern of diuretic renogram, significant increase of differential renal function is expected in only one third of the involved kidneys.
