Retrospective Study
Copyright ©The Author(s) 2020.
World J Gastroenterol. May 21, 2020; 26(19): 2403-2415
Published online May 21, 2020. doi: 10.3748/wjg.v26.i19.2403
Figure 2
Figure 2 Li-Tanaka classification of periampullary diverticulum. Type I: The papilla is located inside the diverticulum and not adjacent to the margin; type II: The papilla is located in the margin of the diverticulum (type IIa: Inside of the margin; type IIb: Outside of the margin, < 1 cm); type III: The papilla is located outside the margin, ≥ 1 cm; type IV: The papilla is located in the margin of the diverticulum, ≥ 2 diverticula (type IVa: The papilla is located outside the margins of at least one diverticulum, < 1 cm; type IVb: The papilla is located outside the margins of all the diverticula, ≥ 1 cm).