1 MCQs in Pediatrics for NEET PG
A term male newborn with suspected trisomy 21 (upslanting palpebral fissures, epicanthic folds, single transverse palmar creases, sandal-gap toes) presents at 12 hours of life with progressive epigastric distension, forceful bilious vomiting after feeds, and a succussion splash on examination. Supine abdominal radiograph shows the classic double-bubble sign. The structure marked **B** in the diagram represents the right upper bubble. Which of the following best describes the pathophysiology at this anatomical location?
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