CS Extension
Notes
**Note 1**: 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 2**: Codes 600-800 are used for contiguous extension from the site of origin. Discontinuous involvement is coded in CS Mets at DX. **Note 3**: Tumor that is adherent to other organs or structures, macroscopically, is classified cT4b. If tumor is present in adhesion(s) upon microscopic examination, the tumor is classified as pT4b. Use code 565 for macroscopic adhesions if no pathologic confirmation, and for pathologically confirmed tumor in adhesions. However, if no tumor is present in adhesion(s) upon microscopic examination, the classification is based upon extent of tumor invasion into or through the wall; use codes 000-160, 200, 400, 450, 458, 500, and 550 as appropriate to describe the microscopically confirmed depth of tumor invasion for these cases. Use codes 600, 655-800 to code invasion of underlying structures from the adherent tumor. **Note 4**: High grade dysplasia and severe dysplasia are generally not reportable in cancer registries, but if a registry does collect these, codes 000 or 050 should be used.| Code | Description | AJCC 7 T | AJCC 6 T | Summary Stage 1977 T | Summary Stage 2000 T |
|---|---|---|---|---|---|
| 000 | In situ, intraepithelial, noninvasive | Tis | Tis | IS | IS |
| 050 | (Adeno)carcinoma, noninvasive, in a polyp or adenoma | Tis | Tis | IS | IS |
| 100 | Invasive tumor confined to mucosa, NOS, including intramucosal, NOS | Tis | Tis | L | L |
| 110 | Invades lamina propria, including lamina propria in the stalk of a polyp | Tis | Tis | L | L |
| 120 | Confined to and not through the muscularis mucosae, including muscularis mucosae in the stalk of a polyp. | Tis | Tis | L | L |
| 130 | Confined to head of polyp, NOS | T1 | T1 | L | L |
| 140 | Confined to stalk of polyp, NOS | T1 | T1 | L | L |
| 150 | Invasive tumor in polyp, NOS | T1 | T1 | L | L |
| 160 | Invades submucosa (superficial invasion), including submucosa in the head or stalk of a polyp | T1 | T1 | L | L |
| 170 | Stated as T1 with no other information on extension | T1 | T1 | L | L |
| 200 | Muscularis propria invaded Stated as T2 with no other information on extension |
T2 | T2 | L | L |
| 300 | Localized, NOS Confined to colon, NOS |
T1 | 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 Wall, NOS |
T3 | T3 | L | L |
| 410 | OBSOLETE DATA CONVERTED V0203 See code 470 Stated as T3 with no other information on extension |
ERROR: | ERROR: | ERROR: | ERROR: |
| 420 | OBSOLETE DATA CONVERTED V0203 See code 458 Fat, NOS |
ERROR: | ERROR: | ERROR: | ERROR: |
| 450 | Extension to: All colon sites: Adjacent tissue(s), NOS Connective tissue Mesenteric fat Mesentery Mesocolon Pericolic fat Ascending and descending colon Retroperitoneal fat Transverse colon and flexures Gastrocolic ligament Greater omentum |
T3 | T3 | RE | RE |
| 458 | Fat, NOS | T3 | T3 | RE | RE |
| 460 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See Note 3, codes 565 and 570 Adherent to other organs or structures, but no microscopic tumor found in adhesion(s) |
T3 | T3 | RE | RE |
| 470 | Stated as T3 with no other information on extension | T3 | T3 | RE | RE |
| 500 | Invasion of/through serosa (mesothelium) (visceral peritoneum) Tumor penetrates to surface of visceral peritoneum |
T4a | T4 | RE | RE |
| 550 | 500 + (450 or 458) | T4a | T4 | RE | RE |
| 560 | Stated as T4a with no other information on extension | T4a | T4 | RE | RE |
| 565 | Adherent to other organs or structures clinically with no microscopic examination Tumor found in adhesion(s) if microscopic examination performed |
T4b | T4 | RE | RE |
| 570 | Adherent to other organs or structures, NOS | T4b | T4 | RE | RE |
| 600 | All colon sites: Small intestine Cecum: Greater omentum Ascending colon: Greater omentum Liver, right lobe Transverse colon and flexures: Gallbladder/bile ducts Kidney Liver Pancreas Spleen Stomach Descending colon: Greater omentum Pelvic wall Spleen Sigmoid colon: Greater omentum Pelvic wall |
T4b | T4 | RE | RE |
| 650 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 655 and 675 All colon sites: Abdominal wall Retroperitoneum (excluding fat) |
T4b | T4 | RE | RE |
| 655 | All colon sites: Abdominal wall All colon sites excluding sigmoid: Retroperitoneum (excluding fat) |
T4b | T4 | RE | RE |
| 660 | Ascending colon: Right kidney Right ureter Descending colon: Left kidney Left ureter |
T4b | T4 | RE | RE |
| 675 | Sigmoid colon: Retroperitoneum (excluding fat) |
T4b | T4 | D | RE |
| 700 | Cecum, ascending, descending and sigmoid colon: Fallopian tube Ovary Uterus |
T4b | T4 | D | D |
| 750 | All colon sites unless otherwise stated above: Adrenal (suprarenal) gland Bladder Diaphragm Fistula to skin Gallbladder Other segment(s) of colon via serosa |
T4b | T4 | D | D |
| 800 | Further contiguous extension: Cecum: Kidney Liver Ureter Transverse colon and flexures: Ovary Fallopian tube Uterus Ureter Sigmoid colon: Cul de sac (rectouterine pouch) Ureter |
T4b | T4 | D | D |
| 850 | Stated as T4b with no other information on extension | T4b | T4 | RE | RE |
| 900 | Stated as T4 [NOS] with no other information on extension | T4NOS | 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 |