CS Extension

Notes

**Note 1**: Palpebral and tarsal conjunctiva line the eyelid, bulbar conjunctiva covers the eyeball, forniceal conjunctiva covers the space between the eyelid and the globe. According to the AJCC, tumors are most likely to arise at the exposed site where the conjunctival epithelium merges with the corneal epithelium, particularly at the temporal limbus. **Note 2**: Use code 140 or 150 if the physician's assignment of T category is the only information available about the extent of the tumor. **Note 3**: The CS Tumor Size table for this schema is obsolete in CS Version 2, and the collection of tumor size value moved to CS Site-Specific Factor 1, Tumor Size.

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	OBSOLETE DATA RETAINED V0200 Tumor confined to conjunctiva	ERROR:	Extension Size Table Csv1	L	L
110	Tumor confined to one subsite of conjunctiva: Bulbar conjunctiva Tumor confined to one subsite of conjunctiva, NOS	Extension Size Table Csv2	Extension Size Table Csv2	L	L
120	Tumor confined to one subsite of conjunctiva: Forniceal conjunctiva Palpebral conjunctiva Tarsal conjunctiva	Extension Size Table Csv2	Extension Size Table Csv2	L	L
140	Stated as T1 with no other information on extension	Extension Size Table Csv2	Extension Size Table Csv2	L	L
150	Stated as T2 with no other information on extension	Extension Size Table Csv2	Extension Size Table Csv2	L	L
300	OBSOLETE DATA RETAINED V0200 Localized, NOS	ERROR:	Extension Size Table Csv1	L	L
350	Localized, NOS	Extension Size Table Csv2	Extension Size Table Csv2	L	L
400	Intraocular extension Cornea Intraocular compartments	T3	T3	L	L
500	OBSOLETE DATA RETAINED V0200 Adjacent extraocular extension, excluding orbit Eyelid	ERROR:	T3	RE	RE
510	Tumor involving more than one subsite of conjunctiva: Bulbar conjunctiva Forniceal conjunctiva Palpebral conjunctiva Tarsal conjunctiva Tumor involving more than one subsite of conjunctiva NOS	T3	T3	RE	RE
530	Adjacent extraocular extension, excluding orbit: Anterior eyelid lamella Caruncle Eyelid margin Lacrimal punctum and canaliculi Plica Posterior eyelid lamella	T3	T3	RE	RE
550	Stated as T3 with no other information on extension	T3	T3	RE	RE
700	OBSOLETE DATA CONVERTED V0200 See code 730 Orbit, NOS	ERROR:	ERROR:	ERROR:	ERROR:
710	Orbital soft tissues without bone invasion Stated as T4a with no other information on extension	T4a	T4a	RE	RE
720	Bone of orbit Stated as T4b with no other information on extension	T4b	T4b	RE	RE
730	Orbit, NOS	T4NOS	T4NOS	RE	RE
780	Adjacent paranasal sinuses Stated as T4c with no other information on extension	T4c	T4c	RE	RE
790	Brain Stated as T4d with no other information on extension	T4d	T4d	D	D
800	Further contiguous extension	T4d	T4d	D	D
810	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

- For CS Extension codes 110-150, and 350 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Site-Specific Factor 1, Tumor Size, as shown in the Extension Size Table CSv2. - For CS Extension codes 110-150, and 350 ONLY, the T category for AJCC 6 staging collected in CSv2 is assigned based on the value of CS Site-Specific Factor 1, Tumor Size, as shown in the Extension Size Table CSv2. - For CS Extension codes 100 and 300 ONLY, the T category for AJCC 6 staging collected in CSv1 is assigned based on the value of CS Tumor Size as shown in the Extension Size Table CSv1.