Rapid Review: Pyloric Stenosis
- Patient will be 2–6 weeks old
- Non-bilious projectile vomiting after feeding and early satiety
- PE will show RUQ olive-like mass (hypertrophied pylorus)
- Labs will show hypochloremic hypokalemic metabolic alkalosis
- Diagnosis is made by ultrasound or UGI series (string sign)
- Treatment is surgical
A 3-week-old boy presents with two days of non-bilious projectile vomiting. Examination reveals a mass in the infant’s right upper quadrant. On a barium upper GI series report, the radiologist states a “string sign” is present. Which of the following is this infant at greatest risk of developing?