You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is In congenital hyperophic pyloric stenosis, the defect is in and explain in detail?
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