|
T category
|
|
T0
| |
No tumor identified, but EBV-positive cervical node involvement
|
|
T1
|
Nasopharynx, oropharynx or nasal cavity
|
Nasopharynx, oropharynx, nasal cavity without parapharyngeal involvement
|
|
T2
|
Parapharyngeal extension
|
Parapharyngeal space and/or adjacent soft tissue involvement (medial pterygoid, lateral pterygoid, prevertebral muscles)
|
|
T3
|
Bony structures and/or paranasal sinuses
|
Bony structures at skull base, cervical vertebra, pterygoid structures, and/or paranasal sinuses
|
|
T4
|
Intracranial extension and/or cranial nerves, hypopharynx, orbit or infratemporal fossa/masticatory space*
|
Intracranial extension, involvement of cranial nerves, hypopharynx, orbit, parotid gland and/or extensive soft tissue infiltration beyond lateral surface of lateral pterygoid
|
|
N category
|
|
N0
|
None
|
None
|
|
N1
|
Unilateral cervical and/or unilateral or bilateral retropharyngeal node(s), ≤ 6 cm in greatest dimension, above supraclavicular fossa
|
Unilateral cervical and/or unilateral or bilateral retropharyngeal node(s), ≤ 6 cm in greatest dimension, above caudal border of cricoid cartilage
|
|
N2
|
Bilateral cervical node(s), ≤ 6 cm in greatest dimension, above supraclavicular fossa
|
Bilateral cervical node(s), ≤ 6 cm in greatest dimension, above caudal border of cricoid cartilage
|
|
N3
|
N3a > 6 cm in greatest dimension, above supraclavicular fossa
|
Unilateral or bilateral cervical node(s), > 6 cm in greatest dimension, below caudal border of cricoid cartilage
|
|
N3b in supraclavicular fossa
|
|
Clinical stage
|
|
I
|
T1N0M0
|
T1N0M0
|
|
II
|
T1N1M0, T2N0-1M0
|
T1N1M0, T2N0-1M0
|
|
III
|
T1-2N2M0, T3N0-2M0
|
T1-2N2M0, T3N0-2M0
|
|
IV
|
IVA: T4N0-2M0
|
T4N0-2M0, T0-4N3M0
|
|
IVB: any T1-4N3M0
|
