pediatrics
Hypertrophic Pyloric Stenosis
Introduction
Hypertrophic pyloric stenosis is obstruction of the pyloric lumen due to pyloric muscular hypertrophy. Diagnosis is by abdominal ultrasonography. Treatment is surgical. Hypertrophic pyloric stenosis may cause almost complete gastric outlet obstruction. It affects a few out of 1000 infants and is more common among males by about a 5:1 ratio, particularly firstborn males. It occurs most often between 3 weeks and 6 weeks of age and rarely after 12 weeks. 