Since 1990, we have performed extramucosal pyloromyotomies by laparosc
opy in 70 infants presenting with congenital hypertrophic pyloric sten
osis. Ever since the first cases, the technique and the instruments ha
ve been adapted. The surgical technique and the precautionary measures
are here explained again. This technique is beneficial for infants wi
th a better postoperative course and avoidance of any skin scar.