Congenital anomalies
Annular pancreas

Author: Deepali Jain, M.D. (see Authors page)

Revised: 7 December 2017, last major update August 2012

Copyright: (c) 2002-2017,, Inc.

PubMed Search: Annular pancreas[TI] free full text[sb]

Cite this page: Jain, D. Annular pancreas. website. Accessed July 16th, 2018.
Definition / general
  • Incidence 1 per 12,000 - 15,000 live births
  • Head of pancreas circles duodenum as a collar and may constrict lumen
  • Due to failure of ventral bud to rotate properly
  • Associated with Down syndrome, esophageal atresia, imperforate anus, congenital heart disease, malrotation of the midgut
  • Pancreatic duct is anterior, courses to the right over the duodenum, then posterior and to left behind duodenum, then near common duct
  • Complications include pancreatitis, duct obstruction, peptic ulcer
  • Has large number of PP cells (of ventral bud origin) in irregular shaped islets
  • Portal annular pancreas is rare variant (JOP 2010;11:453)
Diagrams / tables

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Development of annular pancreas

Clinical images

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Intraoperative images (different cases)