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 200 and 315 for extension involving the mucosa only of adjacent sites. Use higher codes for extension involving deeper tissues of the primary or adjacent sites. **Note 4**: Use code 310 for localized tumor only if no information is available to assign code 105, or 200, 340, 345, or 400. **Note 5**: Use code 320, 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 with normal vocal cord mobility confined to subglottis
ERROR: NA L L
105 Tumor confined to mucosa of subglottis
WITH normal vocal cord mobility
T3 NA L L
200 Extension involving mucosa only of adjacent region(s) or of larynx:
Supraglottis
Glottis
WITH normal vocal cord mobility
T3 NA L L
300 OBSOLETE DATA RETAINED V0200

Tumor involves adjacent regions(s) of larynx
Vocal cords with normal or impaired mobility
ERROR: NA L L
310 Localized , NOS T3 NA L L
315 Extension involving mucosa only of adjacent regions:
Base of tongue
Hypopharynx, NOS
Postcricoid area
Pre-epiglottic tissues
Pyriform sinus
Vallecula
T3 NA RE RE
320 Stated as T3 with no other information on extension T3 NA L L
340 Involvement of deep tissues of any structure in code 105 or 200 T4a NA L L
345 Involvement of any structures in code 105 or 200
WITH impaired vocal cord mobility
T4a NA L L
400 Tumor limited to larynx
WITH vocal cord fixation
T4a NA L L
450 OBSOLETE DATA RETAINED V0200

Localized, NOS
ERROR: NA L L
460 (340, 345, 400) + 315

Involvement of any structures in code 340, 345, or 400 plus involvement of any structure in code 315
T4a NA RE RE
500 Involvement of deep soft tissues or musculature of any structure in code 315
WITH or WITHOUT vocal cord impairment or fixation of larynx or NOS
T4a NA RE RE
600 OBSOLETE DATA RETAINED V0200

Base of tongue
Hypopharynx, NOS
Postcricoid area
Pre-epiglottic tissues
Pyriform sinus (pyriform fossa)
Vallecula
ERROR: NA RE RE
680 Extension to/through:
Cricoid cartilage
Thyroid cartilage
T4a NA RE D
700 Extension to/through:
Cervical esophagus
Deep muscle of tongue
Strap muscles:
Omohyoid
Sternohyoid
Sternothyroid
Thyrohyoid
Oropharynx
Skin
Soft tissues of neck
Thyroid gland
Trachea
T4a NA D D
730 OBSOLETE DATA RETAINED V0200

Contiguous extension to other tissues beyond larynx not specified in codes 700 or 800
ERROR: NA D D
775 Stated as T4a with no other information on extension T4a NA L L
800 Contiguous extension:
Carotid artery (encased)
Mediastinal structures
Prevertebral space
T4b NA D D
801 Further contiguous extension including:
Base of skull
Brain
Dura
Lower cranial nerves (IX, X, XI, XII)
Masticator 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 D D
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