Summary: Validate the use of fetal urine peptidome-analysis and explore amniotic fluid markers for the stratification of fetuses with Posterior Urethral Valve for post-natal renal function.

Summary: The investigators propose a standardized prenatal management, based on the scientific evidence published in the literature, to manage prenatally fetuses with lower urinary tract obstruction (LUTO). The present study is a prospective registry that will evaluate and validate this standardized prenatal management for LUTO.