Location of the Papilla of Vater
The papilla of Vater (major papilla) is located in the second portion (descending part) of the duodenum, specifically on the posteromedial wall. 1
Anatomical Details
The normal anatomical position can be described as follows:
- In 97.1% of cases, the papilla is located in the middle and lower third of the descending duodenum (D2). 1
- The papilla sits on the posteromedial wall of the second duodenal portion. 2
- During endoscopic examination, identification of both the major and minor papilla with photodocumentation is considered ideal practice to ensure proper anatomical recognition. 3
Clinical Significance for Endoscopic Procedures
For lesions located on the medial wall within 5 cm of the papilla, a side-viewing duodenoscope should be used rather than a standard forward-viewing gastroscope. 3 This technical consideration reflects the papilla's medial wall location and the need for optimal visualization during therapeutic interventions.
Anatomical Variants (Rare)
While the standard location is highly consistent, ectopic locations do occur:
- Ectopic papilla locations are rare, with frequency ranging from 0-11.83%. 4
- When ectopic, the papilla is most commonly found in the proximal 2 cm of the third portion of the duodenum (D3). 4
- Extremely rare cases include pyloric location 2 or association with congenital biliary dilatation where 67.8% of patients had distally located papilla beyond the descending duodenum. 5, 6
Practical Implications
Confirmation that any duodenal lesion is not adjacent to or involving the major papilla is critical before performing polypectomy. 3 This emphasizes the clinical importance of accurately identifying the papilla's location in the descending duodenum during endoscopic procedures.