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 420 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 4**: Use code 300 for localized tumor only if no information is available to assign code 105 or 550. **Note 5**: Use code 550, 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, intraepithelial, noninvasive NA NA IS IS
100 OBSOLETE DATA RETAINED V0200

Invasive tumor confined to:
Lamina propria
Submucosa
ERROR: NA L L
105 Tumor confined to buccal mucosa T3 NA L L
200 OBSOLETE DATA CONVERTED V0200
See code 610

Musculature (buccinator)
ERROR: ERROR: ERROR: ERROR:
300 Localized, NOS T3 NA L L
400 Extension involving mucosa only:
Lateral pharyngeal wall
Lip(s) including commissure
Gingiva
Tonsillar pillars and fossae
Tonsils
T3 NA RE RE
420 Extension involving mucosa only:
Hard palate
Soft palate
T3 NA D D
500 OBSOLETE DATA RETAINED V0200

Lip(s) including commissure
ERROR: NA RE RE
510 OBSOLETE DATA RETAINED V0200

Gingiva
ERROR: NA RE RE
550 Stated as T3 with no other information on extension T3 NA L L
600 OBSOLETE DATA RETAINED V0200

Lateral pharyngeal wall
Tonsillar pillars and fossae
Tonsils
ERROR: NA L L
610 Involvement of deep soft tissue or musculature of cheek (buccinators)
Soft tissue, NOS
T4a NA RE L
615 610 + 400

Involvement of deep soft tissue or musculature of cheek plus mucosal involvement of any structure in code 400
T4a NA RE RE
620 Involvement of deep soft tissue or musculature of any structure in code 400 T4a NA RE RE
650 Subcutaneous soft tissue of cheek T4a NA RE RE
660 Skin of check WITH or WITHOUT ulceration T4a NA RE RE
665 (610 - 660) + 420

Involvement of any structure in codes 610 - 660 plus mucosal involvement of any structure in code 420
T4a NA D D
670 OBSOLETE DATA CONVERTED V0200
See code 700

Maxillary sinus
ERROR: ERROR: ERROR: ERROR:
690 Deep soft tissue involvement:
Nasal cavity
Soft palate
Palatine bone
T4a NA D D
700 Cartilage:
Mandible
Maxilla
Cortical bone:
Mandible
Maxilla
Mandible, NOS
Maxilla, NOS
Maxillary sinus (antrum)
Cartilage, NOS
Cortical bone, NOS
Bone, NOS excluding palatine bone, base of skull
T4a NA D D
730 OBSOLETE DATA CONVERTED V0200
See code 790

Skull
ERROR: ERROR: ERROR: ERROR:
750 Deep extrinsic muscle of tongue:
Genioglossus
Hyoglossus
Palatoglossus
Styloglossus
T4a NA D D
775 Stated as T4a with no other information on extension T4a NA L L
790 Contiguous extension:
Base of skull
Carotid artery (encased)
Masticator space
Pterygoid plates
T4b NA D D
800 OBSOLETE DATA RETAINED V0200

Further contiguous extension:
Hard palate
Soft palate
ERROR: NA D D
801 Further contiguous extension:
Brain
Dura
Lower cranial nerves (IX, X, XI, XII)
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