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Medical Definition of Accessory pancreas
1. A detached portion of pancreatic tissue, usually the uncinate process, and hence most often found in the vicinity of the head of the pancreas, but may occur within the gut wall (stomach or duodenum). Synonym: pancreas accessorium. Annular pancreas, a ring of pancreas encircling the duodenum, caused by a failure of the embryologic ventral pancreas to migrate to the right of the duodenum. (05 Mar 2000)