Discussion of Annular pancreas
- Rare anomaly (1/20,000 people).
- Band of pancreatic tissue surrounds the descending duodenum, either partially or completely, and is in continuity with the head of the pancreas.
- Accepted theory is that the ventral pancreatic anlage is responsible for the anomaly by dividing early into two segments.
- The anomaly may be discovered incidentally in asymptomatic patients.
- In others, annular pancreas is associated with duodenal stenosis, postbulbar ulcerations, pancreatitis, or biliary obstruction.
- Surgical resection is recommended for symptomatic cases.
 Imaging Findings for Annular pancreas
- ERCP: An aberrant pancreatic duct communicating with the main pancreatic duct and encircling the duodenum.
- CT or MR images may show normal pancreatic tissue, with or without a small pancreatic duct, encircling the duodenum.
- Upper GI serier: Narrowing of the second portion of the duodenum.
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 References for Annular pancreas
- Yu, Jinxing, Turner, Mary Ann, Fulcher, Ann S., Halvorsen, Robert A. Congenital Anomalies and Normal Variants of the Pancreaticobiliary Tract and the Pancreas in Adults: Part 2, Pancreatic Duct and Pancreas. Am. J. Roentgenol. 2006 187: 1544-1553