T-stages as established by American Joint Committee on Cancer
| Stage of Primary Tumor | Extent of Tumor |
|---|---|
| T1 | Tumor confined to the nasopharynx |
| T2a | Tumor extends to the oropharynx and/or nasal fossa without parapharyngeal extension |
| T2b | Tumor extends to the oropharynx and/or nasal fossa with parapharyngeal extension |
| T3 | Tumor invades bony structures and/or paranasal sinuses |
| T4 | Tumor with intracranial extension and/or involvement of cranial nerves, infratemporal fossa, hypopharynx, or orbit |