- Etiology: idiopathic hypertrophy of circular pylorus muscle leading to gastric outlet obstruction
- AXR: caterpillar sign of peristaltic waves in stomach due to hyperperistalsis
- US: pyloric muscle > 3.5 mm thick, pyloric channel > 17 mm long, minimal passage of fluid through pylorus
- UGI: antral shouldering + pyloric beak / teat + tram track through pylorus all secondary to thickened pylorus
- DDX: prostaglandin E induced gastritis, pylorospasm
- Note: lower esophageal sphincter can mimic appearance of normal pylorus
Radiology Cases of Hypertrophic Pyloric Stenosis




Surgery Cases of Hypertrophic Pyloric Stenosis
