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**: Ignore intraluminal extension to adjacent segment(s) of colon/rectum or to the ileum from the cecum; code depth of invasion or extracolonic 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 colon 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. **Note 8**: Codes 600-800 are used for contiguous extension from the site of origin. Discontinuous involvement is coded in CS Mets at DX.Code| 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 (includes 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 mucosae |
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 and 165 Invades 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 code 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 colon, 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: |
| 450 | For all colon sites: Adjacent tissue(s), NOS Connective tissue Mesenteric fat Mesentery Mesocolon Pericolic fat For ascending and descending colon : Retroperitoneal fat For transverse colon and flexures : Gastrocolic ligament Greater omentum |
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 microscopic 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 | 500 + (420 or 450) | 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 | For all colon sites: Small intestine For cecum: Greater omentum For ascending colon: Greater omentum Liver, right lobe For transverse colon and flexures: Bile ducts Gallbladder Kidney Liver Pancreas Spleen Stomach For descending colon: Greater omentum Pelvic wall Spleen For sigmoid colon: Greater omentum Pelvic wall |
Extension Size AJCC7 | NA | RE | RE |
| 650 | Abdominal wall Retroperitoneum (excluding fat) |
Extension Size AJCC7 | NA | RE | RE |
| 660 | For ascending colon: Kidney, right Ureter, right For descending colon: Kidney, left Ureter, left |
Extension Size AJCC7 | NA | RE | RE |
| 700 | For cecum, ascending colon, descending colon , and sigmoid colon: Fallopian tube Ovary Uterus |
Extension Size AJCC7 | NA | D | D |
| 750 | For all colon sites unless otherwise listed above: Adrenal (suprarenal) gland Bladder Diaphragm Fistula to skin Gallbladder Other segment(s) of colon via serosa |
Extension Size AJCC7 | NA | D | D |
| 800 | Further contiguous extension including: For cecum: Kidney, right Liver Ureter, right For transverse colon and flexures: Ureter For sigmoid colon: Cul de sac (rectouterine pouch) Ureter |
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 |