Table 1 TNM classification of malignant melanoma

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