Reviewer: Deepali Jain, M.D. (see Reviewers page)
Revised: 22 November 2012, last major update August 2012
Copyright: (c) 2001-2012, PathologyOutlines.com, Inc.
● 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’s 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)
Development of annular pancreas
Intraoperative images (different cases)
End of Pancreas > Congenital anomalies > Annular pancreas
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