T Stage
T1: < 2 cm largest diameter
T2: 2-4 cm
T3: > 4 cm
T4a: Invades medial pterygoid, mandible, deep muscle of tongue, larynx, hard palate
T4b: Invades lateral pterygoid, pterygoid plate, lateral wall of nasopharynx, skull base, encases carotid artery
N Stage
N1: single LN <> 6 cm
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Early Stage
Stage I: T1N0
Stage II: T2N0
Locally Advanced
Stage III: T3N0, T1-3N1, T1-3N2
Stage IVa: T4aN0-2; T1-3N2
Stage IVb: T4bNx; TxN3
Metastatic
Stage IVc: TxNxM1
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