In many European countries, obstetric ultrasound (US) is performed routinely during normal pregnancies. This leads to the discovery of many fetal anomalies, and, among them, uro-nephropathies represent one of the largest groups amenable to neonatal management. They are now included in the so-called CAKUT [congenital anomalies of the kidney and urinary tract] group (Renkema et al. 2011; Wiesel et al 2005; Ek et al. 2007).