TNM classification1,2 T-Primary tumour
TX Primary tumour cannot be assessed TO No evidence of primary tumour
Tis carcinoma in-situ T1 Tumour confined to nasopharynx T2 Tumour extends to soft tissues
T2a. Tumour extends to oropharynx and/or nasal cavity without parapharyngeal extension* T2b. Tumour with parapharyngeal extension* T3 Tumour invades bony structures and/or paranasal sinuses T4 Tumour with intracranial extension and/or involvement of cranial nerves, infratemporal fossa, hypopharynx, orbit, or masticator space
N-regional lymph nodes**
NX Regional lymph nodes cannot be assessed
N1 Unilateral*** metastasis in lymph node(s), <6 cm in greatest dimension, above the supraclavicular fossa N2 Bilateral metastasis in lymph node(s), <6 cm in greatest dimension, above the supraclavicular fossa N3 Metastasis in lymph node(s), >6 cm and/or in the supraclavicular fossa
N3a. >6 cm in dimension
N3b. in the supraclavicular fossa#
M- MX Distant metastasis cannot be assessed
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