HPS is the when the muscle layer of the pylorus thickens and elongates preventing contents from the stomach from passing down into the duodenum. Infants will present with the following:
- be male
- weight loss and dehydration
- Projectile vomiting (non-bilious)
- Palpation of a hypertrophied pylorus, “olive”
As described in the reference article listed below, an abnormal or thickened pylorus tend lie adjacent to the gallbladder. In fully evaluating the pylorus I prove that there is stomach content passing through the pylorus by capturing a cine clip and I take a measurement of the muscle thickness and canal length as seen in the drawn image and ultrasound image below.