can you please explain why bilateral renal agenesis cause oligohydramnios
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Because when the fetus failed to develop kidneys, he became unable to contribute urine as he normally regularly would to the amniotic fluid. The result is a diminished total amniotic fluid overall, which in many cases, alerted the obstetrician to the need to do a more complete ultrasound examination of the internal organs of the fetus. Best wishes.