If the gestational age is less than 18 weeks and isolated LUTO is confirmed on ultrasonography, patient is giving the option for prenatal expectant management, or fetal intervention or termination of pregnancy. If patient elects to proceed with fetal intervention, vesico-amniotic shunting is performed and patient is followed by ultrasound once a week. In case the shunt migrates or seems to be obstructed, we will offer repeating the procedure to the patient. If patient elects to proceed with expectant management, follow-up will be every 4 weeks. Delivery date and type of delivery depend on the obstetrical indications.