Table 2. Vienna histological classification.
| Category | Classification |
|---|---|
| 1 | Negative for dysplasia |
| 2 | Indefinite for dysplasia |
| 3 | Low-grade dysplasia |
| 4a | High-grade dysplasia |
| 4b | Intramucosal carcinoma |
| 5 | Submucosal invasion by adenocarcinoma |
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