CS Extension

Notes

**Note 1**: AJCC does not include a Tis category for Neuroendocrine Tumors (NET) of the colon. CS Extension code 000 is mapped to TX for AJCC 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 the T1 categories for NETs of the colon/rectum is based on tumor size. A physician's statement of the T category may be used to code both 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,. Use codes 170, 180, 190, 210, 410, and 810 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 4**: Use code 300 for localized tumor only if no information is available to assign a more specific code. **Note 5**: 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 adhesions upon microscopic examination, use lower codes to describe the microscopically confirmed depth of tumor invasion for these cases.
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepithelial, noninvasive TX Tis IS IS
050 OBSOLETE DATA RETAINED AND REVIEWED V0203
See code 000

(Adeno)carcinoma in a polyp or adenoma, noninvasive
TX Tis IS IS
100 Invasive tumor confined to mucosa, NOS including intramucosal, NOS Extension Size AJCC7 Tis L L
110 Invades lamina propria, including lamina propria in the stalk of a polyp Extension Size AJCC7 Tis L L
120 Confined to and not through the muscularis mucosae, including muscularis mucosae in the stalk of a polyp. Extension Size AJCC7 Tis L L
130 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 110, 120, 160

Confined to head of polyp, NOS
Extension Size AJCC7 T1 L L
140 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 110, 120, 160

Confined to stalk of polyp, NOS
Extension Size AJCC7 T1 L L
150 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 110, 120, 160

Invasive tumor in polyp, NOS
Extension Size AJCC7 T1 L L
160 Invades submucosa (superficial invasion), including submucosa in the stalk of a polyp Extension Size AJCC7 T1 L L
170 Stated as T1a with no other information on extension Extension Size AJCC7 T1 L L
180 Stated as T1b with no other information on extension Extension Size AJCC7 T1 L L
190 Stated as T1 [NOS] with no other information on extension Extension Size AJCC7 T1 L L
200 Muscularis propria invaded T2 T2 L L
210 Stated as T2 with no other information on extension T2 T2 L L
300 Localized, NOS
Confined to colon, NOS
Extension Size AJCC7 T1 L L
400 Extension through wall, NOS
Through muscularis propria or muscularis, NOS
Non-peritonealized pericolic tissues invaded
Perimuscular tissue invaded
Subserosal tissue/(sub)serosal fat invaded
Transmural, NOS
T3 T3 L L
410 Stated as T3 with no other information on extension T3 T3 L L
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/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 5, code 570

Adherent to other organs or structures, but no microscopic tumor found in adhesion(s)
T3 T3 RE RE
490 OBSOLETE DATA CONVERTED V0203
See code 810

Stated as T4, NOS with no other information on extension
ERROR: ERROR: ERROR: ERROR:
500 Invasion of/through serosa (mesothelium) (visceral peritoneum) T4 T4 RE RE
550 500 + (450, 458)

Invasion of/through serosa with extension to tissues listed in code 450 or to fat
T4 T4 RE RE
570 Adherent to other organs or structures, NOS T4 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
T4 T4 RE RE
650 All colon sites:
Abdominal wall
Retroperitoneum (excluding fat)
T4 T4 RE RE
660 Ascending colon:
Right kidney
Right ureter
Descending colon:
Left kidney
Left ureter
T4 T4 RE RE
700 Cecum, ascending, descending and sigmoid colon:
Fallopian tube
Ovary
Uterus
T4 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
T4 T4 D D
800 Further contiguous extension:
Cecum:
Kidney
Liver
Ureter
Transverse colon and flexures:
Ureter
Sigmoid colon:
Cul de sac (rectouterine pouch)
Ureter
Other contiguous extension
T4 T4 D D
810 Stated as T4 with no other information on extension T4 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
- For CS Extension codes 100-190 and 300 ONLY, the T category for AJCC7 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size AJCC 7 Table for this schema.