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