1 MCQs in Pediatrics for NEET PG
A 33-year-old G3P2 woman at 26 weeks gestation presents with polyhydramnios on routine ultrasound. Targeted fetal imaging reveals the pathognomonic finding shown in the diagram: two prominent adjacent anechoic fluid-filled structures in the upper fetal abdomen — the stomach and dilated proximal duodenum — producing the **double bubble sign** marked as **A**. The fetus has intermediate risk for trisomy 21 on first-trimester screening. Detailed fetal echocardiography identifies a complete atrioventricular septal defect, and amniocentesis confirms trisomy 21. Which of the following best explains why the **structure marked A** (the two-bubble appearance) is associated with polyhydramnios in this fetus?
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