Annular Pancreas



Annular Pancreas


Brooke R. Jeffrey, MD

Michael P. Federle, MD, FACR





Key Facts


Imaging



  • CT or MR evidence of pancreatic tissue and annular duct encircling descending duodenum



    • Large pancreatic head encircling 2nd duodenum (marked by gas, enhanced mucosa, or oral contrast)


  • Fluoroscopic barium study (UGI)



    • Concentric narrowing of 2nd part of duodenum ± dilated proximal duodenum


  • ERCP or MRCP



    • Duct draining pancreatic head encircles duodenum


Top Differential Diagnoses



  • Postbulbar peptic ulcer



    • Similar findings on UGI but not on CT or MR


  • Pancreatic ductal carcinoma



    • Can mimic annular pancreas on UGI or CT


  • Duodenal carcinoma



    • Attenuation of duodenal carcinoma is usually different than that of pancreas


Pathology



  • Associated congenital anomalies in up to 75% of pediatric cases



    • e.g., atresia of esophagus, duodenum, or anus

Tags:
Sep 20, 2016 | Posted by in GENERAL RADIOLOGY | Comments Off on Annular Pancreas

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