<prompt> Oligohydramnios is seen in :Renal agenesisOesophageal atresiaExomphalosNeural tube defect  <response>: Ans. is a i.e. Renal agenesis Oligohydramnios is a condition where liquor amnii is deficient 200 ml at term. Sonographically it is defined as : Absence of amniotic fluid pocket.deg Maximum veical diameter of amniotic fluid pocket less than 2 cm.deg Amniotic fluid index less than 5 cms.deg Causes of oligohydramnios : Mnemonic : Dil Mein Ppaar read as pyaar Dil - Drug Prostaglandin Synthetase inhibitors and ACE inhibitors. IUGR Leaking of fluid following amniocentesis or chorionic villus sampling. Mein - Maternal conditions like hypeension and preeclampsia. Ppaar - Post term pregnancy - Premature rupture of membrane - Abruptio-chronic - Amnion Nodosum.deg - Renal anomalies of fetusleading to decreased urine production : Renal agenesisdeg Urethral obstruction Posterior urethral valve Prune Belly syndrome Bilateral Multicystic dysplastic kidneys. Also know : Non Renal Fetal anomalies leading to oligohydraminos : Triploidy Thyroid gland agenesis Congenital hea block Skeletal dysplasia Note : Most common complication of Oligohydramnios - Pulmonary hypoplasiadeg. 