Rapid Review: Pyloric Stenosis

Pyloric Stenosis

  • Patient will be 2 – 6 weeks old
  • Complaining of 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

Sample question:

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?


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