CS Extension

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.
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.