Patient presents for a routine antenatal ultrasound. 35 weeks gestational age by dates. Previous ultrasound at 19 weeks was normal. Presently scan revealed single live male fetus in longitudinal lie with cephalic presentation. Both fetal kidneys were mildly bulky with presence of mild to moderate hydronephrosis and hydroureter. Fetal urinary bladder showed thickened trabeculated wall and dilated posterior urethra. Based on these findings a diagnosis of posterior urethral valves was given. Amniotic fluid index was within normal limits. No fetal ascites seen. No growth retardation.