Collaborative Stage

Note 1: The bones of the lateral wall of the nasal cavity include the maxilla, the perpendicular plate of the palatine bone, the medial pterygoid plate, the labyrinth and inferior concha of the ethmoid. The roof of the nasal cavity is formed by the nasal bone. The floor of the nasal cavity, which forms the roof of the mouth, is composed of the bones of the hard palate: the horizontal plate of the palatine bone posteriorly and the palatine process of the maxilla anteriorly.
Note 2: "Bony invasion" does not include extension to palate, cribriform plate, or pterygoid plates. Extension to these structures is coded separately.
Note 3: Code Base of skull NOS only if no information is available to code to more specific bony structures in the skull.
Note 4: In code 700, "minimal extension to anterior cranial fossa" implies tumor pushing through the cribriform plate, but without invasion of the dura or brain.
Note 5: Use code 300 for localized tumor ONLY if no information Is available to assign codes 100, 110, 200, or 410.
Note 6: Use code 110, 410, 680, 725, 810, or 815 if the physician's assignment of T category is the ONLY information available about the extent of the tumor.

Code	Description	TNM 7 Map	TNM 6 Map	SS77 Map	SS2000 Map
000	In situ; non-invasive	Tis	Tis	IS	IS
100	Invasive tumor confined to one of the following subsites: Septum Floor Lateral wall, including meatus (superior, middle, inferior) and nasal conchae (superior, middle, inferior) Vestibule (edge of naris to mucocutaneous junction) WITHOUT bony invasion	T1	T1	L	L
105	Invasive tumor confined to one subsite listed in code 100 WITH bony invasion	T1	T1	RE	RE
110	Confined to nasal cavity NOS Stated as T1 with no further information on extension	T1	T1	L	L
200	Invasive tumor confined to two or more subsites listed in code 100 WITHOUT bony invasion	T2	T2	L	L
205	Invasive tumor confined to two or more subsites listed in code 100 WITH bony invasion	T2	T2	RE	RE
300	Localized, NOS	T1	T1	L	L
400	Extending to adjacent region within the nasoethmoidal complex: Nasolacrimal duct Ethmoid sinus Choana WITH or WITHOUT bony invasion	T2	T2	RE	RE
410	Stated as T2 with no further information on extension	T2	T2	RE	RE
600	Adjacent organs/structures including: Base of skull NOS (see Note 3) Palate Note: Choana moved to code 400 to correct AJCC mapping	T3	T3	RE	RE
650	Cribiform plate	T3	T3	RE	RE
660	Maxillary sinus	T3	T3	RE	RE
670	Medial wall or floor of the orbit	T3	T3	RE	RE
680	Stated as T3 with no other information on extension	T3	T3	RE	RE
690	Frontal sinus Pterygoid plates	T4a	T4a	RE	RE
700	Tumor invades: Anterior orbital contents Skin of nose Skin of cheek Anterior cranial fossa (minimal extension) Sphenoid sinus	T4a	T4a	D	D
710	OBSOLETE DATA CONVERTED V0200 See code 760 Further contiguous extension including: Orbital apex Dura Brain Middle cranial fossa Cranial nerves (other than V2, maxillary division of trigeminal nerve) Nasopharynx Clivus	T4b	T4b	D	D
725	Stated as T4a with no other information on extension	T4a	T4a	RE	RE
760	Further contiguous extension including: Orbital apex Dura Brain Middle cranial fossa Cranial nerves (other than V2, maxillary division of trigeminal nerve) Nasopharynx Clivus	T4b	T4b	D	D
810	Stated as T4b with no other information on extension	T4b	T4b	D	D
815	Stated as T4 NOS with no other information on extension	T4NOS	T4NOS	RE	RE
950	No evidence of primary tumor	T0	T0	U	U
999	Unknown extension Primary tumor cannot be assessed Not documented in patient record	TX	TX	U	U

NasalCavity

CS Extension