Outcome of hypertrophic pyloric stenosis after pyloromyotomy

: Twenty four patients diagnosed and operated of hypertrophic pyloric stenosis were examined by ultrasonography at diagnostic and sequential after pyloromyotomy. We measured pyloric diameter, thickness and length of the muscle and we calculated the pyloric volume. The overall configuration of the pylorus is more important than specific pyloric dimensions for diagnosis. The pyloric volume is the most discriminating criterion. Sequential sonograms at one and four months showed that all measurements fell to normal levels within four weeks, except pyloric volume.