system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
One week after delivery, a 3550-g (7-lb 13-oz) newborn has multiple episodes of bilious vomiting and abdominal distention. He passed urine 14 hours after delivery and had his first bowel movement 3 days after delivery. He was born at term to a 31-year-old woman. Pregnancy was uncomplicated and the mother received adequate prenatal care. His temperature is 37.1°C (98.8°F), pulse is 132/min, and respirations are 50/min. Examination shows a distended abdomen. Bowel sounds are hypoactive. Digital rectal examination shows a patent anus and an empty rectum. The remainder of the examination shows no abnormalities. An x-ray of the abdomen is shown. Which of the following is the underlying cause of these findings?
assistant
Defective migration of neural crest cells