Pyloric Stenosis
Thickening of pylorus muscle leading to gastric outlet obstruction
Presentation
Physical Exam
2-6 weeks old
Palpable olive-shaped
mass in epigastric
region
Nonbilious &
projectile vomiting
2-6 weeks old
Visible peristaltic
waves
Continues to be
hungry and feed
Associations
Labs
First-born males
Hypokalemic
Hypochloremic
Metabolic alkalosis
Exposure to
macrolides
Treatment
Abdominal Ultrasound
Rehydration &
correction of acidosis
Thickened
& elongated
hypoechoic
pyloric—typo
muscle
Surgical correction
(pyloromyotomy)
Reproduced with permission from Elsayes KM, Oldham
SA: Introduction to Diagnostic Radiology. New York, NY:
McGraw Hill; 2014.
Most common cause of gastric outlet obstruction in infants
Copyright © 2022 by McGraw Hill.
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