COPD USMLE Step 1 Practice Question
A 1 day old male newborn develops coughing, cyanosis, and emesis during his first feeding. The pregnancy was complicated by polyhydramnios. Physical examination shows excessive oral secretions and abdominal distension. A nasogastric tube cannot be advanced into the stomach. Which of the following embryologic abnormalities is the most likely explanation for this infant's condition?
Answer choices
- AFailure of tracheoesophageal septationCorrect answer
- BAbnormal migration of neural crest cells into the aortic arches
- CFailure of bronchial bud branching
- DPersistence of the pleuroperitoneal membranes
- EFailure of laryngotracheal diverticulum formation
- FFailure of the esophagus to elongate and separate from the foregut
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