Table 2.

Vienna or Modified Vienna Classification of Gastrointestinal Neoplasia

Vienna classification	Modified Vienna classification
Category 1	Negative for neoplasia/dysplasia	Negative for neoplasia/dysplasia
Category 2	Indefinite for neoplasia/dysplasia	Indefinite for neoplasia/dysplasia
Category 3	Non-invasive low grade neoplasia (low grade adenoma/dysplasia)	Low grade neoplasia (low grade adenoma/dysplasia)
Category 4	Non-invasive high grade neoplasia	Intramucosal borderline neoplasia
4.1 High grade adenoma/dysplasia	4.1 High grade adenoma/dysplasia
4.2 Non-invasive carcinoma (carcinoma in situ)	4.2 Intramucosal carcinoma, well differentiated
4.3 Suspicion of invasive carcinoma
Category 5	Invasive neoplasia	Definite carcinoma
5.1 Intramucosal carcinoma	5.1 Intramucosal carcinoma, moderately or poorly differentiated
5.2 Submucosal carcinoma or beyond	5.2 Submucosal carcinoma or beyond