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Updated: Feb 23 2020

Annular Pancreas

  • Introduction
    • Embyrologic deformity of the pancreas
    • Pancreas normally develops from one dorsal and two ventral buds
    • Ventral buds normally rotate with duodenum, but if they fail to do so, annular pancreas may form
    • Three theories to explain this:
      • Adherence of the ventral bud to the duodenal wall prior to rotation, resulting in its persistence and encirclement of the duodenum (Lecco's theory).
      • Persistence and enlargement of the left ventral bud (Baldwin's theory).
      • Hypertrophy and fusion of the ventral and dorsal buds before rotation of the gut, resulting in complete encirclement of the duodenum.
  • Presentation
    • Symptoms
      • bowel obstruction in a newborn
        • see Bowel obstruction topic
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