| Classification | Thickness (mm) | Ulceration status/mitoses |
|---|---|---|
| T | ||
| Tis | NA | NA |
| T1 | ≤1.00 | a: Without ulceration and mitosis <1/mm2 |
| b: With ulceration or mitoses ≥1/mm2 | ||
| T2 | 1.01–2.00 | a: Without ulceration |
| b: With ulceration | ||
| T3 | 2.01–4.00 | a: Without ulceration |
| b: With ulceration | ||
| T4 | >4.00 | a: Without ulceration |
| b: With ulceration |
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