Anus - CS Extension

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.

^ 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.

Code	Description	TNM 7th Map	TNM 6th Map	SS77 Map	SS2000 Map
000	In situ, intraepithelial, noninvasive AIN III Bowen disease	Tis	Tis	IS	IS
100	Invasive tumor confined to mucosa, NOS (including intramucosal, NOS)	^	*	L	L
110	Invades lamina propria	^	*	L	L
120	Invades muscularis mucosae	^	*	L	L
160	Invades submucosa (superficial invasion)	^	*	L	L
200	Invades muscularis propria (internal sphincter)	^	*	L	L
300	Incidental finding of malignancy in hemorrhoid, NOS Localized, NOS	^	*	L	L
310	Stated as T1 with no other information on extension	^	*	L	L
320	Stated as T2 with no other information on extension	^	*	L	L
330	Stated as T3 with no other information on extension	^	*	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	^	*	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