Objective: Oligohydramnios is associated with increased perinatal morbidity and mortality. It may be due to a variety of conditions. including rupture of membranes. fetal urinary tract abnormalities such as megacystis caused by posterior urethral valve. https://www.roneverhart.com/AMS-Neve-1073SPX-Single-Preamp-and-EQ-p33827/