Table 1 TNM classification of malignant melanoma
From: Melanoma incidence trends in Limburg after screening and prevention campaigns
| T Classification | |
|---|---|
| pTis melanoma in situ (Clark level I)/severe melanocytic dysplasia | |
| pT1: | -1.0 mm |
| a: without ulceration | |
| b: with ulceration or level IV or V | |
| pT2: | 1.01-2.0 mm |
| a: without ulceration | |
| b: with ulceration | |
| pT3: | 2.01-4.0 mm |
| a: without ulceration | |
| b: with ulceration | |
| pT4: | >4.0 mm |
| a: without ulceration | |
| b: with ulceration | |
| N Classification | |
| pN0: | no regional lymph node metastasis |
| pN1: | 1 lymph node |
| a: micrometastasis | |
| b: macrometastasis | |
| pN2: | 2-3 lymph nodes |
| a: micrometastasis | |
| b: macrometastasis | |
| c: in-transit metastasis/satellite(s) without metastatic lymph nodes | |
| pN3: | 4 or > metastatic lymph nodes, matted lymph nodes, or combinations of in-transit met(s)/satellite(s) and metastatic lymph node(s) |
| M Classification | |
| M1: | Distant skin, subcutaneous, or metastasis beyond the regional lymph nodes |
| M2: | Lung metastasis |
| M3: | All other visceral or any distant metastasis |