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Fig. 3. Retroflex position. (A, C) The papilla is positioned tangentially, making it difficult to perform biliary cannulation. (B, D) The endoscope is advanced while using the up-angle at the inferior duodenal angle, and adjusted to the retroflex position. Consequently, a better view of the papilla can be obtained.
Int J Gastrointest Interv 2022;11:5~12 https://doi.org/10.18528/ijgii210058
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