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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