Prenatal diagnosis and postnatal follow-up of urinary tract congenital malformations are discussed. Among 9501 overall births, 25 newborns with urinary tract congenital malformations were born (2.6 x 1,000). Twenty cases had been diagnosed "in utero" by ultrasound scan (4 cases of Potter sequence, 2 cases of prune-belly anomaly, 3 cases of polymalformed infants with urinary involvement, 10 cases of hydronephrosis, 1 case of ectopic kidney). In 8 newborns a surgical treatment was successfully performed. Eight newborns died and in other 4 cases clinical and ultrasonographic are not yet fulfilled. In 2 cases the prenatal diagnosis of urinary tract malformations was not confirmed by the postnatal evaluation. Our experience shows that the prenatal diagnosis of congenital malformations of urinary tract is particularly useful, even considering the opportunities of perinatal management and postnatal surgical treatment in several cases.