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 |