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Table 1: 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

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