Which of the following congenital malformations will most predictably result in oligohydramnios?
In normal kidney development the kidneys function during the fetal period with the resulting urine contributing to the fluid in the amniotic cavity. When the kidneys fail to develop (renal agenesis), this contribution to the fluid is missing and decreased amniotic fluid (oligohydramnios) results.
Anencephaly
Pyloric stenosis
Renal agenesis
Tracheoesophageal fistula
Abdomen & Pelvis