Padova classification | Japanese classification |
Category | Definition |
1. Negative for dysplasia | Group I | Normal mucosa and benign lesions with no atypia |
1.0 Normal |
1.1 Reactive foveolar hyperplasia |
1.2 Intestinal metaplasia (IM) |
1.2.1 IM Complete type |
1.2.2 IM Incomplete type |
2. Indefinite for dysplasia | Group II | Lesions showing atypia but diagnosed as benign (nonneoplastic) |
2.1 Foveolar hyperproliferation |
2.2 Hyperproliferative IM |
3. Noninvasive neoplasia (flat or elevated [synonym adenoma]) | Group III | Borderline lesions between benign and malignant |
3.1 Low-grade |
3.2 High-grade |
3.2.1 Including suspicious for carcinoma without invasion (intraglandular) |
3.2.2 Including carcinoma without invasion (intraglandular) |
4. Suspicious for invasive carcinoma | Group IV | Lesions strongly suspected of carcinoma |
5. Invasive adenocarcinoma | Group V | Carcinoma |