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 exparenchymal 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, 408, 625, 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	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 (parotid, sublingual) Skeletal muscle: Digastric Genioglossus Geniohyoid Hyoglossus Mylohyoid Pterygoid Styloglossus Stylohyoid	T3	T3	RE	RE
402	Maxillary artery Facial artery or vein	T3	T3	RE	RE
405	Spinal accessory nerve	T3	T3	D	D
408	Stated as T3 with no other information on extension	T3	T3	RE	RE
450	Periosteum of mandible	T4a	T4a	RE	RE
500	Mandible Nerves: Facial (7th) nerve Lingual nerve	T4a	T4a	RE	RE
503	500 + 402	T4a	T4a	RE	RE
505	(450 or 500) + 405 Any structure in 450 or 500 plus spinal accessory nerve	T4a	T4a	D	D
510	External auditory meatus	T4a	T4a	D	D
515	510 + 402	T4a	T4a	D	D
520	OBSOLETE DATA RETAINED V0200 See codes 402 and 650 Major blood vessels: Carotid artery Facial artery or vein Maxillary artery	ERROR:	T4b	RE	RE
600	Skin overlying gland	T4a	T4a	D	D
625	Stated as T4a with no other information on extension	T4a	T4a	RE	RE
650	Blood vessels: Carotid artery (encased)	T4b	T4b	RE	RE
660	650 + (405, 510, or 600) Carotid artery plus any structures in codes 405, 510, and 600	T4b	T4b	D	D
710	Base of skull Skull, NOS	T4b	T4b	D	D
715	(510 or 710) + 405	T4b	T4b	D	D
720	OBSOLETE DATA CONVERTED V0200 See code 405 Spinal accessory nerve	ERROR:	ERROR:	ERROR:	ERROR:
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	D	D
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.