Squamous cell carcinoma of the skin classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Aditya Govindavarjhulla, M.B.B.S. [2], Raviteja Guddeti, M.B.B.S. [3]

Classification

Category	Criteria
T - Primary tumor
TX	Primary tumor cannot be assessed
Tis	Carcinoma in situ
T1	Tumor ≤ to 2 cm
T2	Tumor > 2 cm, and ≤ to 4 cm
T3	Tumor > 4 cm or minor bone erosion or perineural invasion or deep invasion
T4	Tumor with gross cortical bone/marrow, skull base invasion and/or skull base foramen invasion
T4a	Tumor with gross cortical bone/marrow invasion
T4b	Tumor with skull base invasion and/or skull base foramen involvement
N - Regional lymph nodes
NX	Regional lymph nodes cannot be assessed
N0	No regional lymph node metastasis
N1	Metastasis in a single ipsilateral lymph node, tumor size ≤ 3 cm, and no extranodal extension
N2	Metastasis in a single ipsilateral lymph node, tumor size ≤ 3 cm, and presence of extranodal extension; or Tumor size > 3 cm but ≤ 6 cm without extranodal extension; or Metastasis in a single ipsilateral lymph node, tumor size ≤ 3 cm, and presence of extranodal extension; or Metastases in multiple ipsilateral lymph nodes, tumor size ≤ 6 cm without extranodal extension; or In bilateral or contralateral lymph node(s), tumor size ≤ 6 cm without extranodal extension
N2a	Metastasis in a single ipsilateral lymph node, tumor size ≤ 3 cm, and presence of extranodal involvement; or Single ipsilateral node larger, tumor size > 3 cm and ≤ 6 cm, without extranodal extension
N2b	Metastases in multiple ipsilateral nodes, tumor size ≤ 6 cm, and without extranodal extension
N2c	Metastases in bilateral or contralateral lymph node(s), tumor size ≤ 6 cm, and without extranodal extension
N3	Metastasis in a lymph node, tumor size > 6 cm, and without extranodal extension; or In a single ipsilateral node, tumor size > 3 cm, and presence of extranodal extension; or Multiple ipsilateral, contralateral, or bilateral nodes with any extranodal exension; or Single contralateral node of any size with any extranodal extension
N3a	Metastasis in a lymph node, tumor size > 6 cm, and absence of extranodal extension
N3b	Metastasis in a single ipsilateral node, tumor size > 3 cm, and in presence of extranodal extension; or Multiple ipsilateral, contralateral, or bilateral nodes, with any extranodal extension; or Single contralateral node of any size and with any extranodal extension
M - Distant metastasis
M0	No distant metastasis
M1	Distant metastasis

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