Therapy (Hypertrophic Pyloric Stenosis)

Operative findings in a 6-week-old boy with hypertrophic pyloric stenosis. The surgeon is holding the gastric antrum, making the already operated pylorus visible. In performing pyloromyotomy, after a longitudinal incision of the serosa, the muscles are totally divided by careful spreading movements from the antrum to the pyloric vein until the intact mucosa prolapses. Notice the more than 4 mm thick muscle layer at the lower incision border.