CS Extension

Notes

**Note 1**: AJCC does not include a Tis category for gastrointestinal stromal tumors (GIST). Any case with a CS Extension code of 000 is mapped to TX for AJCC 7 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 extra-rectosigmoidal spread as indicated. **Note 3**: The assignment of T categories for GISTs 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 170, 210, 250, and 270 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 4**: Use code 150 only if GIST is described as arising in a polyp. Do not use this code for GIST described as arising in the wall of the rectum and extending into the lumen with a polypoid appearance. **Note 5**: Use code 300 for localized cases only if no information is available to assign a more specific code **Note 6**: 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 adhesion(s) upon microscopic examination, use lower codes to describe the microscopically confirmed depth of tumor invasion for these cases (excluding adherence to liver, see Note 7). **Note 7**: Adherence to the liver capsule is not considered distant metastasis. Use code 570 for any adherence to the liver capsule.
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepithelial, noninvasive TX NA IS IS
050 OBSOLETE DATA RETAINED AND REVIEWED V0203
See code 000

(Adeno)carcinoma in a polyp or adenoma, noninvasive
TX NA IS IS
100 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 155 and 165

Invasive tumor confined to mucosa, NOS, including intramucosal, NOS
Extension Size AJCC7 NA L L
110 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 155 and 165

Lamina propria
Extension Size AJCC7 NA L L
120 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 155 and 165

Confined to and not through the muscularis mucosaee
Extension Size AJCC7 NA L L
130 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 155 and 165

Confined to head of polyp, NOS
Extension Size AJCC7 NA L L
140 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 155 and 165

Confined to stalk of polyp, NOS
Extension Size AJCC7 NA L L
150 Invasive tumor in polyp, NOS Extension Size AJCC7 NA L L
155 Tumor confined to muscular wall Extension Size AJCC7 NA L L
160 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 155, 165

Submucosa (superficial invasion)
Extension Size AJCC7 NA L L
165 Tumor invades through submucosa and muscularis mucosae to involve mucosa Extension Size AJCC7 NA L L
170 Stated as T1 with no other information on extension Extension Size AJCC7 NA L L
200 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 155 and 165

Muscularis propria invaded
Extension Size AJCC7 NA L L
210 Stated as T2 with no other information on extension Extension Size AJCC7 NA L L
250 Stated as T3 with no other information on extension Extension Size AJCC7 NA L L
270 Stated as T4 with no other information on extension Extension Size AJCC7 NA L L
300 Confined to rectosigmoid (junction), NOS
Confined to rectum, NOS
Localized, NOS
Extension Size AJCC7 NA 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
Wall, NOS
Extension Size AJCC7 NA L L
410 OBSOLETE DATA CONVERTED V0203
See code 250

Stated as T3, NOS
ERROR: ERROR: ERROR: ERROR:
420 OBSOLETE DATA CONVERTED V0203
See code 458

Fat, NOS
ERROR: ERROR: ERROR: ERROR:
440 For rectum:
Intraluminal extension to rectosigmoid
Intraluminal extension to anus
Extension Size AJCC7 NA RE L
450 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 440, 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
Extension Size AJCC7 NA RE RE
455 Adjacent (connective) tissue:
For all sites:
Perirectal fat
For rectosigmoid:
Mesentery (including mesenteric fat, mesocolon)
Pericolic fat
For rectum:
Rectovaginal septum
Extension Size AJCC7 NA RE RE
458 Fat, NOS Extension Size AJCC7 NA RE RE
460 OBSOLETE DATA RETAINED AND REVIEWED V0203
See Note 6 and code 570

Adherent to other organs or structures but no tumor found in adhesion(s)
Extension Size AJCC7 NA RE RE
490 OBSOLETE DATA CONVERTED V0203
See code 270

Stated as T4, NOS
ERROR: ERROR: ERROR: ERROR:
500 Invasion of/through serosa (mesothelium) (visceral peritoneum) Extension Size AJCC7 NA RE RE
550 OBSOLETE DATA RETAINED AND REVIEWED V0203
See code 555 and 610

500 with (420 or 450)
Extension Size AJCC7 NA RE RE
555 500 + (440, 455 or 458) Extension Size AJCC7 NA RE RE
560 Invasion of/through serosa with invasion of/through mucosa Extension Size AJCC7 NA RE RE
570 Adherent to liver capsule
Adherent to other organs or structures, NOS
Extension Size AJCC7 NA 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
Colon
Ductus deferens
Prostate
Rectovesical fascia for males only
Seminal vesicle(s)
Skeletal muscle of pelvic floor
Vagina
Extension Size AJCC7 NA 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
Extension Size AJCC7 NA 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
Extension Size AJCC7 NA D D
950 No evidence of primary tumor T0 NA U U
999 Unknown; extension not stated
Primary tumor cannot be assessed
Not documented in patient record
TX NA U U
- For CS Extension codes 100-800 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.