Table 2.
WHO staging system for canine oral malignant melanoma.
| Stage | Tumor Diameter | Lymph Node Involvement | Metastasis |
|---|---|---|---|
| I | <2 cm | No | No |
| II | 2–4 cm | No | No |
| III | > or =4 cm | No | No |
| Any | Yes | No | |
| IV | Any | Yes or No | Yes |
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