CS Extension
Notes
**Note 1**: Connective tissues large enough to be given a specific name are considered adjacent structures. For example, prevertebral fascia and jugular vein have names. Continuous tumor growth from one organ into an adjacent named structure is coded to 600.| 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 | Invasive tumor confined to site of origin | NA | NA | L | L |
| 300 | Localized, NOS | NA | NA | L | L |
| 400 | More than one region of pharynx involved: Oropharynx Nasopharynx Hypopharynx |
NA | NA | RE | RE |
| 500 | Pharynx and oral cavity involved | NA | NA | RE | RE |
| 550 | Any of codes 100-500 WITH fixation |
NA | NA | RE | RE |
| 600 | Extension to adjacent structures (See note) |
NA | NA | RE | RE |
| 800 | Further contiguous extension | NA | NA | D | D |
| 950 | No evidence of primary tumor | NA | NA | U | U |
| 999 | Unknown; extension cannot be assessed Primary tumor cannot be assessed Not documented in patient record |
NA | NA | U | U |