Table 1. Table defining the similarities between the revised Vienna classification, Japanese group classification, and classification of our system.

The revised Vienna classification	Description	Japanese group classification	classification by our system
Category 1	Negative for neoplasia/dysplasia	Group 1	Negative
Category 2	Indefinite for neoplasia/dysplasia	Group 2	Negative
Category 3	Low grade adenoma/dysplasia	Group 3	Adenoma
Category 4.1	High grade adenoma/dysplasia	Group 4	Positive
Category 4.2	Non-invasive carcinoma (Ca in situ)	Group 5	Positive
Category 4.3	Suspicion for invasive carcinoma	Group 5	Positive
Category 5.1	Intramucosal carcinoma	Group 5	Positive
Category 5.2	Submucosal carcinoma or beyond	Group 5	Positive
Category X	Inadequate specimen for diagnosis	Group X	unclassifiable