CS Extension

This input is used for staging

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**: Use codes 400 and 400 for extension involving the mucosa only of adjacent sites. Use higher codes for extension involving the deeper tissues of the primary of adjacent sites. **Note 4**: Use code 300 for localized tumor only if no information is available to assign code 105, 470, or 510. **Note 5**: Use code 470, 775, 810, or 815 if the physician's assignment of T category is the only information available about the extent of the tumor.

Default

999

NAACCR Item

NAACCR #2810
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intrapeithelial, noninvasive NA NA IS IS
100 OBSOLETE DATA RETAINED V0200

Invasive tumor confined to lamina propria (mucoperiosteum) (stroma)
ERROR: NA L L
105 Tumor confined to mucosa of gum T3 NA L L
300 Localized, NOS T3 NA L L
400 Extension involving mucosa only:
Buccal mucosa (inner cheek)
Labial mucosa (inner lip), lip
Lateral pharyngeal wall
Soft palate including uvula
Tonsillar pillars
Tonsillar fossae
Tonsils
T3 NA RE RE
440 OBSOLETE DATA CONVERTED V0203
See code 400

Extension via mucosa to upper lip (labial mucosa)
ERROR: ERROR: ERROR: ERROR:
470 Stated as T3 with no other information on extension T3 NA L L
500 OBSOLETE DATA RETAINED V0200

Buccal mucosa (inner cheek)
Labial mucosa (inner lip), lip
ERROR: NA RE RE
510 Involvement of deep tissue or periosteum of gum T4a NA L L
520 510 + 400

Involvement of deep tissue of gum plus mucosal involvement of any structure in code 400
T4a NA RE RE
530 Involvement of deep soft tissue or musculature of any structure in code 400 T4a NA RE RE
550 Facial muscle, NOS
Subcutaneous soft tissue of face
T4a NA RE RE
600 OBSOLETE DATA RETAINED V0200

Lateral pharyngeal wall (tonsillar pillars and fossae, tonsils)
ERROR: NA RE RE
700 Cartilage of mandible or maxilla
Cortical bone of mandible or maxilla
Mandible, NOS
Maxilla, NOS
Cartilage, NOS
Cortical bone, NOS
Bone, NOS except base of skull
T4a NA RE RE
720 Extrinsic muscle of tongue:
Genioglossus
Hyoglossus
Palatoglossus
Styloglossus
T4a NA RE RE
760 Skin of face T4a NA D D
765 Maxillary sinus (antrum) T4a NA D D
770 OBSOLETE DATA REVIEWED AND CHANGED V0203
See codes 700, 765

Cartilage of maxilla
Cortical bone of maxilla
Maxilla NOS
Maxillary sinus
ERROR: ERROR: ERROR: ERROR:
775 Stated as T4a with no other information on extension T4a NA L L
790 OBSOLETE DATA CONVERTED V0200
See Code 800

Skull
ERROR: ERROR: ERROR: ERROR:
800 Contiguous extension:
Base of skull
Carotid artery (encased)
Masticator space
Pterygoid plates
T4b NA D D
801 Further contiguous extension including:
Brain
Dura
Lower cranial nerves (IX, X, XI, XII)
Mediastinal structures
Prevertebral space
Mediastinal structures
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