CS Extension

This input is used for staging

Notes

**Note 1**: High-grade squamous intraepithelial lesions (HSIL) and anal intraepithelial neoplasia (AIN) grade II III are not normally collected by cancer registries. AIN II III or AIN III is reportable to standard-setters (except the Commission on Cancer). If your registry collects any of these, use code 000. **Note 2**: The assignment of T1, T2 , and T3 categories for tumors of the anus 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 code 310, 320, 330, or 850 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 3**: Code incidental finding of malignancy in hemorrhoid according to greatest extension of tumor into wall of anus. Code as Localized, NOS if extension not specified. **Note 4**: Codes 400-750 are used for contiguous extension from the site of origin. Discontinuous involvement is coded in CS Mets at DX.

Default

999

NAACCR Item

NAACCR #2810

Code	Description	AJCC 7 T	AJCC 6 T	Summary Stage 1977 T	Summary Stage 2000 T
000	In situ, intraepithelial, noninvasive AIN III Bowen disease	Tis	Tis	IS	IS
100	Invasive tumor confined to mucosa, NOS (including intramucosal, NOS)	Extension Size	Extension Size	L	L
110	Invades lamina propria	Extension Size	Extension Size	L	L
120	Invades muscularis mucosae	Extension Size	Extension Size	L	L
160	Invades submucosa (superficial invasion)	Extension Size	Extension Size	L	L
200	Invades muscularis propria (internal sphincter)	Extension Size	Extension Size	L	L
300	Incidental finding of malignancy in hemorrhoid, NOS Localized, NOS	Extension Size	Extension Size	L	L
310	Stated as T1 with no other information on extension	Extension Size	Extension Size	L	L
320	Stated as T2 with no other information on extension	Extension Size	Extension Size	L	L
330	Stated as T3 with no other information on extension	Extension Size	Extension Size	L	L
400	Ischiorectal fat/tissue Perianal skin Perirectal skin Rectal mucosa or submucosa Rectal wall Skeletal muscle(s): Anal sphincter (external) Levator ani Subcutaneous perianal tissue	Extension Size	Extension Size	RE	RE
600	Perineum Vulva	T4	T4	RE	RE
700	Bladder Pelvic peritoneum Urethra Vagina	T4	T4	D	D
750	Broad ligament(s) Cervix uteri Corpus uteri Prostate	T4	T4	D	D
800	Further contiguous extension	T4	T4	D	D
850	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 100-400 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 100-400 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.