CS Extension

Notes

**Note 1**: Involvement of or extension to bone includes any type of tumor extension to the bone, such as erosion, invasion, extension, penetration, or destruction. **Note 2**: Extension to structures in codes 400 and higher may be from one or both ethmoid sinuses. **Note 3**: In code 700, "minimal extension to anterior cranial fossa" implies tumor pushing through cribriform plate, but without invasion of the dura or brain. **Note 4**: Code Base of skull NOS only if no information available to code to more specific bony structures in skull. **Note 5**: Use code 300 for localized tumor only if no information is available to assign codes 100, 120, 160, or 315. **Note 6**: Use code 315 410, 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 AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepithelial, noninvasive Tis Tis IS IS
120 Invasive tumor confined to left or right ethmoid sinus
WITHOUT bony involvement
T1 T1 L L
140 OBSOLETE DATA CONVERTED V0200
See code 320

Confined to both ethmoid sinuses without bone involvement
ERROR: ERROR: ERROR: ERROR:
160 Confined to ethmoid sinus, NOS
WITHOUT bony involvement
T1 T1 L L
220 Invasive tumor confined to either left or right ethmoid
WITH bony invasion (involvement of perpendicular plate of ethmoid bone or ethmoid air cells)
T1 T1 L L
240 OBSOLETE DATA CONVERTED V0200
See code 340

Confined to both ethmoid sinuses
WITH bony invasion (involvement of perpendicular plate of ethmoid bone or ethmoid air cells)
ERROR: ERROR: ERROR: ERROR:
260 Confined to ethmoid sinus, NOS
WITH bony invasion (involvement of perpendicular plate of ethmoid bone or ethmoid air cells)
T1 T1 L L
300 Localized, NOS T1 T1 L L
315 Stated as T1 with no other information on extension T1 T1 L L
320 Confined to both ethmoid sinuses
WITHOUT bony involvement
T2 T2 RE RE
340 Confined to both ethmoid sinuses
WITH bony invasion (involvement of perpendicular plate of ethmoid bone or ethmoid air cells)
T2 T2 RE RE
400 Extension to nasal cavity with or without bony invasion (Involvement of perpendicular plate of ethmoid bone or ethmoid air cells):
Floor
Lateral wall
Nasal vestibule
Nasal cavity, NOS
Septum
Turbinates
T2 T2 RE RE
410 Stated as T2 with no other information on extension T2 T2 RE RE
620 Base of skull, NOS T3 T3 RE RE
630 Cribriform plate T3 T3 RE RE
640 Medial wall or floor of orbit
Orbital plate
T3 T3 RE RE
650 Maxillary sinus T3 T3 RE RE
660 Hard palate T3 T3 D D
680 Stated as T3 with no other information on extension T3 T3 RE RE
700 Anterior orbital contents
Skin of nose
Skin of cheek
Anterior cranial fossa (minimal extension) (see Note 3)
Pterygoid plates
Sphenoid sinus
Frontal sinus
T4a T4a RE RE
720 700 + 660

Any structure in code 700 plus hard palate
T4a T4a D D
725 Stated as T4a with no other information on extension T4a T4a RE RE
760 Orbital apex
Dura
Brain
Middle cranial fossa
Cranial nerves (other than V2, maxillary division of trigeminal nerve)
Nasopharynx
Clivus
T4b T4b RE RE
780 760 + 660

Any structure in code 760 plus palate
T4b T4b D D
800 Further contiguous extension 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 not stated
Primary tumor cannot be assessed
Not documented in patient record
TX TX U U