Version June 2024
| 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 |
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