CS Extension

Notes

**Note 1**: AJCC does not include a Tis category for Neuroendocrine Tumors (NET)) of the rectum/rectosigmoid. CS Extension code 000 is mapped to TX for AJCC stage and in situ Summary Stage. **Note 2**: For rectosigmoid, ignore intraluminal extension to adjacent segment(s) of colon and rectum; code depth of invasion or rectosigmoidal spread as indicated. **Note 3**: The assignment of the T1 categories for NETs of the colon/rectum is based on tumor size. A physician's statement of the T category may be used to code both 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. Use code 170, 180, 190, 210, 410, and 810 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 a more specific code. **Note 5**: Use code 570 for tumor with macroscopic adhesions to other organs or structures and for pathologically confirmed tumor in adhesions. However, if no tumor is present in adhesions upon microscopic examination, use lower codes to describe the microscopically confirmed depth of tumor invasion for these cases.
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepithelial, noninvasive TX Tis IS IS
050 OBSOLETE DATA RETAINED AND REVIEWED V0203
See code 000

(Adeno)carcinoma in a polyp or adenoma, noninvasive
TX Tis IS IS
100 Invasive tumor confined to mucosa, NOS (including intramucosal, NOS) Extension Size AJCC7 Tis L L
110 Invades lamina propria, including lamina propria in the stalk of a polyp Extension Size AJCC7 Tis L L
120 Confined to and not through the muscularis mucosae, including muscularis mucosae in the stalk of a polyp. Extension Size AJCC7 Tis L L
130 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 110, 120, 160

Confined to head of polyp, NOS
Extension Size AJCC7 T1 L L
140 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 110, 120, 160

Confined to stalk of polyp, NOS
Extension Size AJCC7 T1 L L
150 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 110, 120, 160

Invasive tumor in polyp, NOS
Extension Size AJCC7 T1 L L
160 Submucosa (superficial invasion), including submucosa in the stalk of a polyp Extension Size AJCC7 T1 L L
165 For rectum:
Intraluminal extension to rectosigmoid
Intraluminal extension to anal canal/anus
Extension Size AJCC7 T1 RE L
170 Stated as T1a with no other information on extension Extension Size AJCC7 T1 L L
180 Stated as T1b with no other information on extension Extension Size AJCC7 T1 L L
190 Stated as T1 [NOS] with no other information on extension Extension Size AJCC7 T1 L L
200 Muscularis propria invaded T2 T2 L L
210 Stated as T2 with no other information on extension T2 T2 L L
300 Localized, NOS
Confined to rectum, NOS
Extension Size AJCC7 T1 L L
400 Extension through wall, NOS
Invasion through muscularis propria or muscularis, NOS
Non-peritonealized pericolic tissues invaded
Perimuscular tissue invaded
Subserosal tissue/(sub)serosal fat invaded
Transmural, NOS
T3 T3 L L
405 (200 or 400) +165 T3 T3 RE L
410 Stated as T3 with no other information on extension T3 T3 L L
420 OBSOLETE DATA CONVERTED V0203
See code 458

Fat, NOS
ERROR: ERROR: ERROR: ERROR:
450 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 165, 405, 455, and 610

Adjacent (connective) tissue:
For all sites:
Perirectal fat
For rectosigmoid:
Mesentery (including mesenteric fat, mesocolon)
Pericolic fat
For rectum:
Extension to anus
Rectovaginal septum
T3 T3 RE RE
455 Adjacent (connective) tissue:
For all sites:
Perirectal fat
For rectosigmoid:
Mesentery (including mesenteric fat, mesocolon)
Pericolic fat
For rectum:
Rectovaginal septum
T3 T3 RE RE
458 Fat, NOS T3 T3 RE RE
460 OBSOLETE DATA RETAINED AND REVIEWED V0203
See Note 5, code 570

Adherent to other organs or structures, but no microscopic tumor found in adhesion(s)
T3 T3 RE RE
490 OBSOLETE DATA CONVERTED V0203
See code 810

Stated as T4, NOS with no other information on extension
ERROR: ERROR: ERROR: ERROR:
500 Invasion of/through serosa (mesothelium) (visceral peritoneum) T4 T4 RE RE
550 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 555, 610

(500) with [(420 or (450)]
T4 T4 RE RE
555 500 + (165, 405, 455, or 458) T4 T4 RE RE
570 Adherent to other organs or structures, NOS T4 T4 RE RE
600 OBSOLETE DATA CONVERTED V0203
See code 610

Rectosigmoid:
Cul de sac (rectouterine pouch)
Pelvic wall
Small intestine
Rectum:
Bladder for males only
Cul de sac (rectouterine pouch)
Ductus deferens
Pelvic wall
Prostate
Rectovesical fascia for male only
Seminal vesicle(s)
Skeletal muscle of pelvic floor
Vagina
ERROR: ERROR: ERROR: ERROR:
610 For all sites:
Cul de sac (rectouterine pouch)
Pelvic wall
For rectosigmoid:
Pelvic plexuses
Small intestine
For rectum:
Anus (excluding intraluminal extension)
Bladder for males only
Ductus deferens
Prostate
Rectovesical fascia for males only
Seminal vesicle(s)
Skeletal muscle of pelvic floor
Vagina
T4 T4 RE RE
700 For rectosigmoid:
Bladder
Colon via serosa
Fallopian tube(s)
Ovary(ies)
Prostate
Ureter(s)
Uterus
For rectum:
Bladder for females only
Bone(s) of pelvis
Urethra
Uterus
T4 T4 D D
800 Further contiguous extension including:
For all sites:
Other segments of colon via serosa
For rectosigmoid:
Skeletal muscles of pelvic floor
Vagina
For rectum:
Sacral plexus
Sacrum
Ovary(ies)
Perineum, perianal skin
T4 T4 D D
810 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 CSExtension codes 000-190 and 300 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size AJCC 7 Table for this schema.