A fetus has polyhydramnios. Ultrasound reveals esophageal atresia. This condition is most directly caused by abnormal development of which structure?
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Correct answer: Tracheoesophageal septum
Abnormal partitioning of the esophagus and trachea by the tracheoesophageal septum causes esophageal atresia and tracheoesophageal fistula. Polyhydramnios results from impaired fetal swallowing.
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