<prompt> Causes of polyhydraminos include:a Diabetes mellitusb Preeclampsiac Esophageal atresiad Renal agenesise Anencephalyacdbdecdeace  <response>: Friends, for a second - lets forget the lists of conditions leading to OligohydramniosPolyhydramnios This happens quite often in exams.Lets reason out each option one by one.Option a Diabetes mellitusWe all know polyhydramnios is a complication of maternal diabetes.Pathophysiology:Maternal hyperglycemiaFetal hyperglycemiaPolyuria of fetus and osmotic diuresisPolyhydramnios Option a is correctOption b PreeclampsiaPreeclampsiaDecreased uteroplacental circulationDecreased fetal renal blood flowDecrease urine production by fetusOligohydramniosOption c Esophageal atresiaWe all know - Amniotic fluid is kept in balance with the rate of production, by fetal swallowing of amniotic fluid.In case of oesophageal atresiaDecrease fetal swallowingi.e., Decrease absorptionPolyhydramnios option c is correctSame is the case with congenital diaphragmatic herniaFacial cleftsNeck masses.Option d Renal agenesisRenal agenesisDecrease urine productionOligohydramnios Option d is incorrectSame holds good for posterior urethral value in males.Option e AnencephalyIn anencephaly or meningomyelocele or spina bifidaMeninges are exposedIncrease transudation of fluid from exposed meningesPolyhydramnios Option e is correctSo friends, it is not essential to mug up most of the causes of oligopolyhydramnios.Some causes which need to mugged up are: 