Case Study:

A 21-year-old G2P1 woman feels that she is large for dates. She has felt fetal movement for the past week. She has a screening ultrasound scan performed at 16 weeks gestation. This ultrasound reveals that there is markedly increased amniotic fluid (polyhydramnios).


Which of the following fetal abnormalities is most likely to cause this finding?

A Renal agenesis

B Ventricular septal defect

C Cytomegalovirus infection

D Small intestinal atresia

E Anencephaly

F Gastroschisis

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Answer / Explanation:

[HIDE]

(D) CORRECT.
Anomalies that interfere with fetal swallowing are most likely to produce an excess of amniotic fluid. Esophageal and intestinal atresias do this.HIDE]