<prompt> Oligohydramnios is seen in:Renal agenesisCholangioma of placentaSpina bifidaEsophageal atresia  <response>: Oligohydramnios can be caused by - Renal anomalies Uteroplacental insufficiency: IUGR ACE inhibitors Premature rupture of membranes Amniocentesis leak Pre-ecclampsia Amnion nodosum NSAIDs Post term pregnancy over estimated gestational age The sonographic diagnosis of oligohydramnios is usually based on an AFI 5 cm or a single deepest pocket of amnionic fluid of 2 cm 