CS Extension
| 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: Auditory bones: Incus Malleus Stapes Vestibulocochlear organ: Cochlea Septum Semicircular ducts: Ampullae Saccule Utricle Tympanic membrane (ear drum) |
NA | NA | L | L |
| 300 | Localized, NOS | NA | NA | L | L |
| 400 | Adjacent connective tissue: Auditory tube (Eustachian tube, pharyngotympanic tube) Nerve(s) |
NA | NA | RE | RE |
| 600 | Adjacent organs/structures: External auditory meatus (ear canal) Internal carotid artery Mastoid antrum Nasopharynx Temporal bone |
NA | NA | RE | RE |
| 700 | Regional extension, NOS | NA | NA | RE | RE |
| 800 | Further contiguous extension: Meninges |
NA | NA | D | D |
| 950 | No evidence of primary tumor | NA | NA | U | U |
| 999 | Unknown; extension not stated Primary tumor cannot be assessed Not documented in patient record |
NA | NA | U | U |