Hypertrophic pyloric stenosis (HPS) is among the most common surgical disorders in infancy
and presents in approximately 3: 1000 live births in the United States. There is a 4: 1 male
dominance, and white infants are more commonly affected. Birth order seems to play a role,
because firstborn boys are more likely to be affected by the disorder than their siblings. The
precise cause of the pyloric circular muscle hypertrophy remains poorly understood. Some
proposed causes include postnatal work hypertrophy, congenital delay of the pyloric …