Background: The ultrasound equipment provides the opportunity to identify the urinary tract anomalies prenatally by transabdominal scanning as the kidneys are seen in most patients by 16 to 18 weeks.Aim of the work: The purpose of this study was to identify the sonographic criteria of urinary tract anomalies and describe the outcome of prenatal detected urinary tract anomalies.Methods: This was a follow up study of fifty fetuses with urinary tract abnormalities in fetal medicine unit between Jan 2009 and Feb 2010Each woman was subjected to conventional and detailed ultrasound examination with follow –up every two weeks.Results: Urinary system anomalies were found in 50 of 1521 with a prevalence of 3.3%, the renal anomalies was the principle reason for termination of pregnancy in 9 cases (18%), in 44 cases (88%) there was full agreement between the ultrasound observation and the postnatal follow up of the cases or autopsy, in 6 cases autopsy finding had not been found by ultrasound examination. So the true positive was 44, the false negative was 6, the sensitivity of ultrasound in diagnosis was 88%.Conclusions: the outcome of congenital urinary tract anomalies is generally good but these are associated with mortality especially with presence of structural developmental anomalies of the kidneys, Ultrasound diagnosis when made early may prevent additional renal damage by timing of delivery and postnatal treatment.