CS Extension

Notes

**Note 1**: The orbital tissues are the support systems of the globe, confined to the space within the surrounding bony structure. The tissues include fat, striated and smooth muscle, and fibroconnective, vascular, lymphoid, peripheral nerve, and optic nerve tissue. **Note 2**: AJCC stages only sarcomas of the orbit. AJCC values are derived as NA for all non-sarcoma histologies coded to this site. **Note 3**: Code 000 may be used only for non-sarcoma histologies coded to this site. Sarcomas do not present as in situ or noninvasive tumors.

Code	Description	AJCC 7 T	AJCC 6 T	Summary Stage 1977 T	Summary Stage 2000 T
000	In situ, intraepithelial, noninvasive	TX	TX	IS	IS
100	Tumor confined to orbit Localized, NOS	Extension Size	Extension Size	L	L
200	Stated as T1 with no other information on extension	Extension Size	Extension Size	L	L
300	Stated as T2 with no other information on extension	Extension Size	Extension Size	L	L
400	Tumor of any size with invasion of orbital tissues and/or bony walls Stated as T3 with no other information on extension	T3	T3	RE	RE
500	Invasion of globe	T4	T4	RE	RE
600	Extension to: Adjacent paranasal sinuses Cranium	T4	T4	RE	RE
650	Extension to: Eyelids Temporal fossa Nasal cavity	T4	T4	D	D
700	Central nervous system	T4	T4	D	D
800	Further contiguous extension	T4	T4	D	D
810	Stated as T4 with no other information on extension	T4	T4	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

- For CS Extension codes 100, 200, and 300 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size Table for this schema. A CS Tumor Size code takes precedence over a CS Extension "stated as T" code; however, if CS Tumor Size is coded as unknown, the T category may be assigned based on "stated as T" recorded in CS Extension. - For CS Extension codes 100, 200, and 300 ONLY, the T category for AJCC 6staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size Table for this schema. A CS Tumor Size code takes precedence over a CS Extension "stated as T" code; however, if CS Tumor Size is coded as unknown, the T category may be assigned based on "stated as T" recorded in CS Extension.