CS Extension

Notes

**Note 1**: AJCC does not include a Tis or TX category for melanoma of mucosa of head and neck sites. CS Extension codes of 000 and 999 are mapped to NA and AJCC stage group is derived as NA. **Note 2**: AJCC does not include a T1 or T2 category for mucosal melanoma of head and neck sites. **Note 3**: Extension to structures in codes 180, 185, and 400 and higher may be from one or both ethmoid sinuses. **Note 4**: Use codes 180 and 185 for extension involving the mucosa only of adjacent sites. Use higher codes for extension involving the deeper tissues of the primary or adjacent sites. **Note 5**: Use code 170 for localized tumor only if no information is available to assign codes 105, 165, 190, 200, or 210. **Note 6**: Use code 190, 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 NA NA IS IS
105 Tumor confined to mucosa of left or right ethmoid sinus T3 NA L L
120 OBSOLETE DATA RETAINED V0200

Invasive tumor confined to left or right ethmoid sinus without bone involvement
ERROR: NA L L
140 OBSOLETE DATA RETAINED V0200

Confined to both ethmoid sinuses without bone involvement
ERROR: NA RE RE
160 OBSOLETE DATA RETAINED V0200

Confined to ethmoid, NOS without bone involvement
ERROR: NA L L
165 Confined to mucosa of ethmoid sinus, NOS T3 NA L L
170 Localized, NOS T3 NA L L
175 Confined to mucosa of both ethmoid sinuses T3 NA RE RE
180 Extension involving mucosa only of nasal cavity including:
Floor
Lateral wall
Nasal vestibule
Nasal cavity, NOS
Septum
Turbinates
T3 NA RE RE
185 Extension to mucosa only of adjacent structures:
Frontal sinus
Maxillary sinus
Nasopharynx
Sphenoid sinus
T3 NA RE RE
190 Stated as T3 with no other information on extension T3 NA L L
200 Extension to deep soft tissue of left or right ethmoid sinus T4a NA L L
210 Extension to deep soft tissue of ethmoid sinus , NOS
Soft tissue NOS
T4a NA L L
215 (200 or 210) + (180 or 185)

Extension to deep soft tissue of left or right ethmoid sinus or ethmoid sinus, NOS with mucosal involvement of structures in code 180 or 185
T4a NA RE RE
218 Extension to deep soft tissue of both ethmoid sinuses T4a NA RE RE
220 Invasive tumor confined to either left or right ethmoid sinus with bony invasion
(Involvement of perpendicular plate of ethmoid bone or ethmoid air cells)
T4a NA L L
240 OBSOLETE DATA CONVERTED V0200
See code 270

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)
T4a NA L L
265 (220 or 260) + (180 or 185)

Confined to left or right ethmoid sinus or ethmoid sinus, NOS with bony invasion plus mucosal involvement of structures in code 180 or 185
T4a NA RE RE
270 Confined to both ethmoid sinuses with bony invasion
(Involvement of perpendicular plate of ethmoid bone or ethmoid air cells)
T4a NA RE RE
300 OBSOLETE DATA CONVERTED V0200
See code 170

Localized, NOS
ERROR: ERROR: ERROR: ERROR:
400 OBSOLETE DATA RETAINED V0200

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
ERROR: NA RE RE
450 Extension to deep tissues of adjacent structures with or without bony invasion:
Frontal sinus
Maxillary sinus
Nasopharynx
Sphenoid sinus
T4a NA RE RE
620 OBSOLETE DATA CONVERTED V0200
See code 750

Base of skull, NOS
ERROR: ERROR: ERROR: ERROR:
630 OBSOLETE DATA CONVERTED V0200
See code 750

Cribriform plate
ERROR: ERROR: ERROR: ERROR:
640 Medial wall or floor of orbit
Orbital plate
T4a NA RE RE
650 OBSOLETE DATA RETAINED V0200

Maxillary sinus
ERROR: NA RE RE
660 Hard palate T4a NA D D
700 OBSOLETE DATA RETAINED V0200

Anterior orbital contents
Frontal sinus
Maxillary nerve (the second division of the 5th cranial nerve)
Minimal extension to anterior cranial fossa
Pterygoid plates
Skin of external nose or cheek
Sphenoid sinus
ERROR: NA RE RE
710 Anterior orbital contents
Skin of nose
Skin of cheek
Pterygoid plates
T4a NA RE RE
720 OBSOLETE DATA RETAINED V0200

(660) + (700)
ERROR: NA D D
725 Stated as T4a with no other information on extension T4a NA L L
750 Anterior cranial fossa
Base of skull
Clivus
Cribriform plate
Middle cranial fossa
T4b NA RE RE
760 OBSOLETE DATA RETAINED V0200

Brain
Clivus
Cranial nerves other than the maxillary nerve (the second division of the 5th cranial nerve)
Dura
Middle cranial fossa
Nasopharynx
Orbital apex or roof
ERROR: NA RE RE
770 (710 or 750) + 660

Involvement of any structure in code 710 or 750 plus hard palate
T4b NA D D
780 OBSOLETE DATA RETAINED V0200

(660) + (760)
ERROR: NA D D
800 Contiguous extension:
Brain
Dura
Lower cranial nerves (IX, X, XI, XII)
Middle cranial fossa
Orbital apex
T4b NA D D
801 Further contiguous extension :
Carotid artery (encased)
Masticator space
Mediastinal structures
Prevertebral space
T4b NA D D
810 Stated as T4b with no other information on extension T4b NA D D
815 Stated as T4 [NOS] with no other information on extension T4NOS NA L L
950 OBSOLETE DATA RETAINED V0200

No evidence of primary tumor
ERROR: NA U U
999 Unknown; extension not stated
Primary tumor cannot be assessed
Not documented in patient record
NA NA U U