CS Extension
Notes
**Note 1**: For this site, AJCC defines Tis as high-grade dysplasia, which includes "all non-invasive neoplastic epithelium that was previously called carcinoma in situ." Cancers stated to be noninvasive or in situ are classified as Tis. High-grade dysplasia is generally not reportable in cancer registries, but if a registry does collect it, code 000 should be used. **Note 2**: Use codes 110, 120, and 160 in preference to code 150 if information about the depth of invasion into the layers of the polyp is available. **Note 3**: Ignore intraluminal extension to adjacent segment(s) of esophagus or to more distal parts of stomach and code depth of invasion or extra-gastric spread as indicated. **Note 4**: If the diagnosis states linitis plastica and no other information regarding extension is available, use code 350. Linitis plastica is defined as diffuse involvement of the entire stomach wall. **Note 5**: Codes 600-700 are used for contiguous extension from the site of origin. Discontinuous involvement is coded in CS Mets at DX, except for implants within the stomach (code 300).| Code | Description | AJCC 7 T | AJCC 6 T | Summary Stage 1977 T | Summary Stage 2000 T |
|---|---|---|---|---|---|
| 000 | In situ, intraepithelial, non-invasive; high-grade dysplasia | Tis | Tis | IS | IS |
| 050 | (Adeno)carcinoma, noninvasive, in a polyp | Tis | Tis | IS | IS |
| 100 | Invasive tumor confined to mucosa, NOS, (including intramucosal, NOS) | T1a | T1 | L | L |
| 110 | Invades lamina propria | T1a | T1 | L | L |
| 120 | Invades muscularis mucosae | T1a | T1 | L | L |
| 125 | Stated as T1a with no other information on extension | T1a | T1 | L | L |
| 130 | OBSOLETE DATA RETAINED V0200 Cardia/GE Junction (EGJ), and the proximal 5 cm of the fundus and body of the stomach have been moved into this schema from the Stomach schema in CSv2, and the detailed polyp information is not required Confined to head of polyp Extension to stalk |
ERROR: | T1 | L | L |
| 140 | OBSOLETE DATA RETAINED V0200 Cardia/EGJ and the proximal 5 cm of the fundus and body of the stomach have been moved into this schema from Stomach schema in CSv2, and detailed polyp information is not required Confined to stalk of polyp |
ERROR: | T1 | L | L |
| 150 | Tumor in polyp NOS | T1NOS | T1 | L | L |
| 160 | Invades submucosa (superficial invasion) Stated as T1b with no other information on extension |
T1b | T1 | L | L |
| 170 | Stated as T1 [NOS] with no other information on extension | T1NOS | T1 | L | L |
| 200 | Invades into but not through muscularis propria | T2 | T2a | L | L |
| 300 | Implants inside stomach Localized, NOS |
T1NOS | T1 | L | L |
| 350 | Linitis plastica (and no other information regarding extension available) (See Note 4) |
T2 | T2a | RE | L |
| 360 | Stated as T2 with no other information on extension | T2 | T2NOS | L | L |
| 400 | Extension through wall, NOS Invasion through muscularis propria or muscularis, NOS Perimuscular tissue invaded Subserosal tissue/(sub)serosal fat invaded |
T3 | T2b | L | L |
| 420 | Adventitia and/or soft tissue invaded Esophagus is described as "FIXED" |
T3 | T3 | RE | RE |
| 430 | OBSOLETE DATA CONVERTED V0203 See code 480 Stated as T3 [NOS] | ERROR: | ERROR: | ERROR: | ERROR: |
| 450 | Extension to adjacent (connective) tissue WITHOUT perforation of visceral peritoneum covering these structures: Gastric artery Ligaments: Gastrocolic Gastrohepatic Gastrosplenic Omentum, NOS Greater Lesser Perigastric fat |
T3 | T2b | RE | RE |
| 480 | Stated as T3 with no other information on extension | T3 | T2b | L | RE |
| 500 | Invasion of/through serosa (mesothelium) (tunica serosa) (visceral peritoneum), including perforation of visceral peritoneum covering the gastric ligaments or the omentum WITHOUT invasion of adjacent structures | T4a | T3 | RE | RE |
| 550 | 500 + 450 | T4a | T3 | RE | RE |
| 570 | Pericardium Pleura Diaphragm |
T4a | T4 | RE | RE |
| 580 | Stated as T4a with no other information on extension | T4a | T4 | RE | RE |
| 600 | OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 570, 605, and 615 Diaphragm Duodenum via serosa or NOS Esophagus via serosa Ileum Jejunum Liver Pancreas Small intestine, NOS Spleen Transverse colon (including flexures) |
T4a | T4 | RE | RE |
| 605 | Duodenum via serosa Duodenum, NOS Esophagus via serosa Ileum Jejunum Liver Pancreas Small intestine, NOS Spleen Transverse colon (including flexures) |
T4b | T4 | RE | RE |
| 610 | OBSOLETE DATA REVIEWED V0203 See codes 570 and 615 Pleura Pericardium |
T4a | T4 | RE | RE |
| 615 | 605 + 570 | T4b | T4 | RE | RE |
| 700 | Abdominal wall Adrenal gland Kidney Retroperitoneum |
T4a | T4 | D | D |
| 710 | OBSOLETE DATA CONVERTED V0203 See code 810 Stated as T4 [NOS] |
ERROR: | ERROR: | ERROR: | ERROR: |
| 720 | OBSOLETE DATA CONVERTED V0203 See code 580 Stated as T4a [NOS] |
ERROR: | ERROR: | ERROR: | ERROR: |
| 800 | Further contiguous extension including but not limited to: Aorta Vertebral body Trachea Stated as unresectable, NOS |
T4b | T4 | D | D |
| 805 | Stated as T4b with no other information on extension | T4b | T4 | D | D |
| 810 | Stated as T4 [NOS] with no other information on extension | T4NOS | T4 | RE | RE |
| 820 | OBSOLETE DATA CONVERTED V0203 See code 805 Stated as T4b [NOS] |
ERROR: | ERROR: | ERROR: | ERROR: |
| 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 |