Ampulla of vater
The ampulla of Vater is a conical structure at the confluence of the common bile duct and the main pancreatic duct that protrudes at the major duodenal papilla into the medial aspect of the descending or horizontal duodenum. The entire structure is encased by smooth muscle fibers that compose the sphincter of Oddi 2. It traverses a dehiscence of the duodenal wall and terminates at the major duodenal papilla.
Normally, the junction of the common bile duct (CBD) and the main pancreatic duct occurs in three ways 1
- a common duct (the ampulla of Vater) : ~ 60%
- a “double-barreled” opening at the apex of the papilla : ~ 38%
- separate duodenal openings for the two canals : ~ 2%
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- 1. Kim JH, Kim MJ, Chung JJ et-al. Differential diagnosis of periampullary carcinomas at MR imaging. Radiographics. 22 (6): 1335-52. doi:10.1148/rg.226025060 - Pubmed citation
- 2. Pham DT, Hura SA, Willmann JK et-al. Evaluation of periampullary pathology with CT volumetric oblique coronal reformations. AJR Am J Roentgenol. 2009;193 (3): W202-8. doi:10.2214/AJR.08.2069 - Pubmed citation
- 3. Aspestrand F, Erichsen A, Kolbenstvedt A et-al. Radiological appearance of the ampulla of Vater. Radiologe. 1988;28 (11): 533-5. - Pubmed citation
- 4. Guo ZJ, Chen YF, Zhang YH et-al. CT virtual endoscopy of the ampulla of Vater: preliminary report. Abdom Imaging. 2011;36 (5): 514-9. doi:10.1007/s00261-010-9644-2 - Pubmed citation
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