Anatomical variants · USMLE Step 1

Imaging reveals a Meckel diverticulum. This anomaly results from incomplete obliteration of which structure?

  1. Vitelline duct
  2. Allantois
  3. Urachus
  4. Foregut diverticulum
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Correct answer: Vitelline duct

Meckel diverticulum results from persistence of the vitelline duct. It may contain ectopic gastric tissue and cause bleeding.

Difficulty: Medium Question 19 of 20

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