Pediatric Radiology > Abdominal > Upper GI > Hypertrophic Pyloric Stenosis - Sonographic Features


Hypertrophic Pyloric Stenosis - Sonographic Features

· Hypoechoic ring of hypertrophic pyloric muscle around echogenic mucosa centrally on cross section
· Indentation of muscle mass on fluid-filled antrum on longitudinal section
· Pyloric length (mm) >14mm
· Pyloric muscle wall thickness > 4mm - measured from outer wall to mucosa
· Exaggerated peristaltic waves
· Delayed or no gastric emptying of fluid into duodenum

Muscle wall thickness =4.0mm Pyloric cannal length=1.87cm
Thick pyloric muscle Elongated pyloric muscle
 




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