CS Extension

Notes

**Note 1**: The nonperitonealized perimuscular tissue is, for jejunum and ileum, part of the mesentery and, for duodenum in areas where serosa is lacking, part of the interface with the pancreas. **Note 2**: Codes 100-200 take priority over code 300. Code depth of invasion in preference to intraluminal spread or lateral extension to adjacent segment(s) of small intestine or cecum. **Note 3**: High-grade dysplasia is not always collected by cancer registries but, if collected, it should be coded 000.
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 Tis Tis IS IS
095 OBSOLETE DATA CONVERTED V0203
See Code 155

Stated as T1a with no other information on extension
ERROR: ERROR: ERROR: ERROR:
100 Invasive tumor confined to mucosa, NOS, including intramucosal, NOS T1a T1 L L
110 Invasion of lamina propria T1a T1 L L
120 Invasion of muscularis mucosae T1a T1 L L
125 OBSOLETE DATA CONVERTED V0203
See code 165

Stated as T1b with no other information on extension
ERROR: ERROR: ERROR: ERROR:
130 Invasive tumor confined to head of polyp T1a T1 L L
140 Invasive tumor onfined to stalk of polyp T1a T1 L L
150 Invasion of polyp, NOS T1a T1 L L
155 Stated as T1a with no other information on extension T1a T1 L L
160 Invasion of submucosa (superficial invasion) T1b T1 L L
165 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 Muscularis propria invaded

Stated as T2, NOS with no other information on extension
T2 T2 L L
300 Intraluminal spread to other segments of small intestine or cecum
Localized, NOS
T1NOS T1 L L
400 Invasion through muscularis propria or muscularis, NOS
Extension through wall, NOS
Subserosal tissue/(sub)serosal fat invaded
Transmural, NOS
Wall, NOS

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 Adjacent connective tissue
Adjacent tissue(s), NOS
Mesentery, including mesenteric fat, invaded 2 centimeters (cm) or less in depth, or invaded, NOS (depth of invasion not specified)
Nonperitonealized perimuscular tissue invaded 2 cm or less in depth, or invaded, NOS (depth of invasion not specified)
Retroperitoneum invaded 2 cm or less in depth, or invaded, NOS (depth of invasion not specified
T3 T3 RE RE
458 Fat, NOS T3 T3 RE RE
500 Invasion of/through serosa (mesothelium) (tunica serosa) (visceral peritoneum) T4 T4 L RE
550 500 + (450 or 458) T4 T4 RE RE
600 For duodenum primary only:
Ampulla of Vater
Diaphragm
Extrahepatic bile duct(s)
Gallbladder
Pancreas
Pancreatic duct
T4 T4 RE RE
650 For duodenum primary only:
Blood vessel(s), major:
Aorta
Gastroduodenal artery
Portal vein
Renal vein
Superior mesenteric artery or vein
Vena cava
Greater omentum
Hepatic flexure
Kidney, NOS
Kidney, right
Liver, NOS
Liver, quadrate lobe
Liver, right lobe
Omentum, NOS
Transverse colon
Ureter, right
For jejunum or ileum primary only:
Colon, including appendix
T4 T4 RE RE
660 For duodenum primary only:
Stomach
T4 T4 RE RE
670 For all small intestine sites:
Abdominal wall via serosa
Mesentery invaded greater than 2 cm in depth
Nonperitonealized perimuscular tissue invaded
greater than 2 cm in depth
Retroperitoneum invaded greater than 2 cm in depth
T4 T4 RE RE
680 For all small intestine sites:
Other segments of the small intestine via serosa
T4 T4 RE RE
690 OBSOLETE DATA CONVERTED V0203
See code 805

Stated as T4, NOS
ERROR: ERROR: ERROR: ERROR:
700 For jejunum or ileum primary only:
Bladder
Fallopian tube(s)
Ovary(ies)
Uterus
T4 T4 D D
800 Further contiguous extension T4 T4 D D
805 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