eRadiograph Volume 7: Imaging of Oral Cavity | Page 167

TNM Staging of Nasopharyngeal Carcinoma
T1 tumor confined to nasopharynx- Extension of NPC to oropharynx, nasal cavity has a favorable
outcome similar to lesions restricted to nasopharynx – These are also classified as T1 tumors.  

T2 tumor extends to parapharyngeal fat.
T3 tumor invades skull base paranasal sinuses, adjacent bones.
T4 tumor extends intracranially, perineurial spread,masticator space, hypopharynx or
orbit. (Extension to masticator space – look for perine