| TNM Classification |
Histological/Clinical Features |
| Paranasal Sinuses (C30.0,
C30.1) |
| TX |
Primary tumor cannot be assessed |
| T0 |
No evidence of primary tumor |
| Tis |
carcinoma in situ |
| Maxillary Sinus |
|
| T1 |
limited to maxillary sinus mucosa with no erosion or destruction of
bone |
| T2 |
causing bone erosion or destruction including extension into hard palate
and/or middle nasal meatus, except extension to posterior wall of maxillary
sinus and pterygoid plates |
| T3 |
Tumor invades any of the following: bone of the posterior wall of maxillary
sinus, subcutaneous tissues, floor or medial wall of orbit, pterygoid
fossa, ethmoid sinuses |
| T4a |
invades anterior orbital contents, skin of cheek, pterygoid plates,
infratemporal fossa, cribiform plate, sphenoid or frontal sinuses |
| T4b |
invades any of the following: orbital apex, dura, brain, middle cranial
fossa, cranial nerves other than maxillary division of trigeminal nerve
(V2), nasopharynx, or clivus |
| Nasal Cavity and Ethmoid Sinus |
|
| T1 |
Confined to ethmoid with or without bone erosion |
| T2 |
invading two subsites in single region or extending to involve adjacent
region within nasoethmoidal complex, with or without bony invasion |
| T3 |
extends to invade medial wall or floor of orbit, maxillary sinus, palate,
or cribiform plate |
| T4a |
invades any of the following: anterior orbital contents, skin of nose
or cheek, minimal extension to anterior cranial fossa, pterygoid plates,
sphenoid or frontal sinuses |
| T4b |
invades any of the following: orbital apex, dura, brain, middle cranial
fossa, cranial nerves other than (V2), nasopharynx or clivus |
