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 350-370 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, 470, or 510. **Note 5**: Use code 470, 725, 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 mucosa of oral site T3 NA L L
200 OBSOLETE DATA CONVERTED V0200
See code 510

Musculature invaded
ERROR: ERROR: ERROR: ERROR:
300 Localized, NOS T3 NA L L
350 Extension involving mucosa only to adjacent sites in oral cavity including tongue T3 NA RE RE
370 Extension involving mucosa only:
Inferior surface of soft palate including uvula
Lateral pharyngeal wall
Lingual surface of epiglottis
Oropharynx, NOS
Vallecula
T3 NA RE RE
470 Stated as T3 with no other information on extension T3 NA L L
500 OBSOLETE DATA RETAINED V0200

Adjacent oral cavity
ERROR: NA RE RE
510 Involvement of deep soft tissue or musculature of structure in code 105
Soft tissue, NOS
T4a NA L L
520 510 + (350 or 370)

Involvement of deep soft tissue or musculature of structure in code 105 plus mucosal involvement of any structure in code 350 or 370
T4a NA RE RE
550 Deep soft tissue or musculature of any structure in code 350 T4a NA RE RE
570 Deep soft tissue or musculature of any structure in code 370 T4a NA RE RE
600 OBSOLETE DATA RETAINED V0200

Extension to oropharynx
Inferior surface of soft palate
Lateral pharyngeal wall
Lingual surface of epiglottis
Vallecula
ERROR: NA RE RE
690 Cortical bone of mandible
Cortical bone of maxilla
Mandible, NOS
Maxilla, NOS
Maxillary antrum (sinus)
Cortical bone, NOS
Cartilage, NOS
Bone, NOS excluding base of skull
T4a NA D D
700 OBSOLETE DATA RETAINED V0200

Extension to adjacent structures:
Mandible
Maxilla
Maxillary antrum (sinus)
Nasal cavity
Skin of face/neck
Tongue
ERROR: NA D D
705 Nasal cavity
Skin of face/neck
T4a NA D D
710 Deep (extrinsic) muscle of tongue:
Genioglossus
Hyoglossus
Palatoglossus
Styloglossus
T4a NA D D
720 OBSOLETE DATA CONVERTED V0200
See code 750

Skull
ERROR: ERROR: ERROR: ERROR:
725 Stated as T4a with no other information on extension T4a NA L L
750 Contiguous extension:
Base of skull
Carotid artery (encased)
Masticator space
Pterygoid plates
T4b NA D D
800 OBSOLETE DATA RETAINED V0200

Further contiguous extension
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