In congenital hyperophic pyloric stenosis, the defect is in
Correct Answer: Circular muscle fibres
Description: Infantile Hyperophic Pyloric stenosis In HPS, hyperophy of circular muscle of pylorus results in constriction & obstruction of gastric outlet Accquired condition Incidence of 1 in 3000 to 4000 live bihs This condition is most common between the ages of 3-6 weeks Associated anomalies in 6-20% cases : Esophageal atresia, Hirschprung's disease, ARM and malrotation Ref: Sabiston 20th edition Pgno : 1869
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