Correlate the following pediatric clinical vignettes with their most likely underlying embryologic or pathophysiologic etiology.
- A 4-week-old male infant presents with forceful, non-green vomiting after every feed. He is constantly hungry and has a firm, ovoid mass palpable in the right upper quadrant.Hypertrophy of the circular muscular layer at the gastric outlet
- A 3-day-old term neonate has marked abdominal distension and has not yet had a bowel movement. Digital rectal examination produces a sudden expulsion of foul-smelling gas and stool.Arrested craniocaudal migration of neural crest cells to the distal colon
- A 7-month-old infant is evaluated for a large amount of painless, maroon-colored stool in the diaper. The patient is hemodynamically stable, and the abdomen is soft and non-tender.Incomplete obliteration of the omphalomesenteric duct leading to ectopic gastric mucosa
- A 2-week-old previously healthy female neonate suddenly develops green-stained emesis. She appears irritable and lethargic with a minimally distended abdomen.Arrested counterclockwise rotation of the midgut around the superior mesenteric artery
Answer
The clinical vignettes correlate respectively to hypertrophic pyloric stenosis, Hirschsprung disease, Meckel diverticulum, and midgut volvulus due to malrotation.
Each presentation maps to a distinct pathophysiologic mechanism: pyloric stenosis is structural muscle hypertrophy, Hirschsprung is a neural migration defect, Meckel diverticulum is a vestigial duct anomaly, and malrotation is a rotational embryologic defect.
Step-by-Step Solution
Key Concept
Pathophysiology and embryologic origins of acute pediatric gastrointestinal disorders.
Estimated Time:1m 30s