CS Extension
Notes
**Note 1**: Impaired vocal cord mobility may be described as vocal cord paresis, and may suggest invasion of intrinsic laryngeal muscle. Fixation of the vocal cord maybe described as immobility of the arytenoids noted on endoscopy, paralysis of the vocal cords, or deviation of larynx to the fixed side. **Note 2**: Use code 450 for localized tumor ONLY if no information is available to assign codes 100 through 400. **Note 3**: Use code 775, 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 | Tis | Tis | IS | IS |
| 100 | Invasive tumor with normal vocal cord mobility confined to subglottis Stated as T1 with no other information on extension |
T1 | T1 | L | L |
| 300 | Tumor involves adjacent regions(s) of larynx: Supraglottis Glottis WITH normal or impaired mobility Stated as T2 with no other information on extension |
T2 | T2 | L | L |
| 400 | Tumor limited to larynx WITH vocal cord fixation Stated as T3 with no other information on extension |
T3 | T3 | L | L |
| 450 | Localized, NOS | T1 | T1 | L | L |
| 600 | Base of tongue Hypopharynx, NOS Postcricoid area Pre-epiglottic tissues Pyriform sinus (pyriform fossa) Vallecula |
T4a | T4a | RE | RE |
| 680 | Extension to/through cricoid cartilage or thyroid cartilage | T4a | T4a | RE | D |
| 700 | Extension to/through: Cervical esophagus Deep extrinsic muscles of tongue Strap muscles: Omohyoid Sternohyoid Sternothyroid Thyrohyoid Oropharynx Skin Soft tissues of neck Thyroid gland Trachea |
T4a | T4a | D | D |
| 730 | OBSOLETE DATA CONVERTED V0200 See code 800 Contiguous extension to other tissues beyond larynx not specified in codes 700 or 800 |
ERROR: | ERROR: | ERROR: | ERROR: |
| 775 | Stated as T4a with no other information on extension | T4a | T4a | RE | RE |
| 800 | Further contiguous extension including: Mediastinal structures Prevertebral space Carotid artery (encased) |
T4b | T4b | D | D |
| 810 | Stated as T4b with no other information on extension | T4b | T4b | D | D |
| 815 | Stated as T4 [NOS] with no other information on extension | T4NOS | T4NOS | RE | RE |
| 950 | No evidence of primary tumor | T0 | T0 | U | U |
| 999 | Unknown; extension not stated Primary tumor cannot be assessed Not documented in patient record |
TX | TX | U | U |