Primary
Tis carcinoma in situ
T1 tumor < 2 cm
T2 tumor 2 to 4 cm
T3 tumor > 4 cm
T4 tumor invades adjacent organs
Neck
N0 - No clinically palpable lymph node
N1 - single Ipsilateral lymph node < 3 cm
N2a - single ipsilateral node >3cm to 6 cm
N2b - multiple ipsilateral lymph nodes < 6 cm
N2c - bilateral or contralateral lymph nodes < 6 cm
N3 Nodes > 6 cm
Distant metastasis
Mx Distant metastasis cannot be assessed
M0 No distant metastasis
M1 Distant metastasis
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