CS Extension

Notes

**Note 1**: AJCC considers "in situ carcinoma of salivary gland" an impossible diagnosis. Any case so coded will be mapped to an unknown AJCC stage, in situ Summary Stage. **Note 2**: Periosteum is a fibrous membrane that wraps the outer surface of bones. Mucoperiosteum is a compound structure of mucous membrane and periosteum. Cortical bone is the dense compact outer layer of bone. **Note 3**: The assignment of T1 and T2 categories for tumors of major salivary glands without extraparenchymal extension is based on tumor size. A physician's statement of the T category may be used to code CS Tumor Size and/or CS Extension if this is the only information in the medical record regarding one or both of these fields. However the two fields are coded independently: for example the record may document size but not extension, other than the physician's statement of the T category. Use codes 305, 310, 410, 725, 810, or 815 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 4**: Use code 300 for localized tumor only if no information is available to assign codes 100, 305, or 310.

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	Invasive tumor confined to gland/duct of origin Multiple foci confined to substance of parotid gland	Extension Size	Extension Size	L	L
300	Localized, NOS	Extension Size	Extension Size	L	L
305	Stated as T1 with no other information on extension	Extension Size	Extension Size	L	L
310	Stated as T2 with no other information on extension	Extension Size	Extension Size	L	L
350	Microscopic extraparenchymal extension ONLY to periglandular soft/connective tissue	Extension Size	Extension Size	RE	RE
400	Macroscopic extraparenchymal extension to: Periglandular soft/connective tissue Another major salivary gland (submaxillary, sublingual) Pharyngeal mucosa Skeletal muscle: Digastric Masseter Pterygoid Sternocleidomastoid Stylohyoid	T3	T3	RE	RE
402	Maxillary artery Facial artery or vein	T3	T3	RE	RE
405	Spinal accessory nerve	T3	T3	RE	D
406	405 + 402	T3	T3	RE	D
408	Stated as T3 with no other information on extension	T3	T3	RE	RE
420	External auditory meatus Skin overlying gland	T4a	T4a	RE	RE
450	Periosteum of mandible	T4a	T4a	RE	RE
500	Auricular nerve Mandible Mastoid process	T4a	T4a	RE	RE
505	(420, 450, 500) +402	T4a	T4a	RE	D
510	(420, 450, 500) + 405 Any structure in code 420, 450, or 500 plus spinal accessory nerve	T4a	T4a	RE	D
700	Facial (7th) nerve	T4a	T4a	RE	D
705	700 + 402	T4a	T4a	RE	D
708	700 + 405	T4a	T4a	RE	D
720	OBSOLETE DATA CONVERTED V0200 See code 405 Spinal accessory nerve	ERROR:	ERROR:	ERROR:	ERROR:
725	Stated as T4a with no other information on extension	T4a	T4a	RE	RE
740	Carotid artery (encased) Jugular vein	T4b	T4b	RE	RE
750	OBSOLETE DATA REVIEWED AND CHANGED V0203 Recode involved structures to 402, 406, 505, 705, 740, 755, 758 as appropriate. Major blood vessel(s): Carotid artery (encased) Facial artery or vein Jugular vein Maxillary artery	ERROR:	ERROR:	ERROR:	ERROR:
755	740 + 405 Any structure in code 740 plus spinal accessory nerve	T4b	T4b	RE	D
758	740 + 700 Any structure in code 740 plus facial nerve	T4b	T4b	RE	D
760	Base of skull Skull, NOS	T4b	T4b	RE	D
770	Pterygoid plates	T4b	T4b	D	D
800	Further contiguous extension	T4b	T4b	D	D
810	Stated as T4b with no other information on extension	T4b	T4b	RE	RE
815	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 100-350 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. - For CS Extension codes 100-350 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size as shown in the Extension Size Table for this schema.