Match each underlying pathophysiological or embryological mechanism with the corresponding pediatric gastrointestinal disorder.
- Arrest of craniocaudal neural crest cell migration during embryogenesis, leading to a segment that fails to relax.Hirschsprung disease
- Persistence of the proximal portion of the vitelline duct, often containing ectopic mucosal tissue.Meckel diverticulum
- Postnatal hypertrophy and hyperplasia of the circular muscularis layer at the gastric outlet.Pyloric stenosis
- Arrest of normal midgut rotation during fetal development, leading to a narrow mesenteric base attachment.Intestinal malrotation
- Invagination of a segment of bowel into an adjacent segment, frequently secondary to lymphoid hyperplasia.Intussusception
Answer
Neural crest cell arrest causes Hirschsprung disease; Vitelline duct persistence causes Meckel diverticulum; Circular muscle hypertrophy causes Pyloric stenosis; Arrest of midgut rotation causes Intestinal malrotation; and Bowel invagination causes Intussusception.
Understanding the embryological and pathophysiological basis of pediatric gastrointestinal diseases is critical for distinguishing their clinical presentations. Hirschsprung disease results from failed neural crest migration, affecting the enteric nervous system. A Meckel diverticulum forms when the vitelline duct fails to completely obliterate. Intestinal malrotation stems from a failure of the midgut to undergo its normal 270-degree rotation during development, leading to a dangerously narrow mesenteric attachment. Pyloric stenosis is an acquired postnatal hypertrophy of the pylorus. Finally, intussusception is a mechanical telescoping of the bowel, often secondary to a lead point like enlarged Peyer patches following a viral infection.
Step-by-Step Solution
Key Concept
Embryologic and pathophysiologic mechanisms of pediatric gastrointestinal disorders