Oligohydramnios — an abnormally small amount of amniotic fluid. It is a rare con- dition in which the volume of amniotic fluid during the third trimester is 300 ml. Insufficient fluid surrounding the fetus increases the potential for cord compres- sion, fetal hypoxia, fetal malformation, perinatal demise, and dysfunctional and prolonged labor. Although the etiology is unknown, the disorder is associated with amniotic fluid leakage, placental insuffi- ciency, postmaturity, intrauterine growth retardation, and major congenital abnor- malities of the fetal kidney or lungs
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