The Vienna Classification of Gastrointestinal Epithelial Neoplasia was the first attempt at standardisation of the different histologic criteria between West and East. It is made up in categories each giving a suggestion for clinical management.

References:

Dixon MF. Gastrointestinal epithelial neoplasia: Vienna revisited. Gut. 2002;51(1):130‐131. doi:10.1136/gut.51.1.130

Schlemper RJ, Riddell RH, Kato Y, et al. The Vienna classification of gastrointestinal epithelial neoplasia. Gut. 2000;47(2):251‐255. doi:10.1136/gut.47.2.251