CS Extension

This input is used in derivation

Notes

**Note 1**: AJCC does not include a Tis category for Neuroendocrine Tumors (NET) of the small intestine. CS Extension code 000 is mapped to TX for AJCC stage and in situ for Summary Stage. **Note 2**: Ignore intraluminal or lateral extension to adjacent segment(s) of small intestine and code depth of invasion or spread outside the small intestine as indicated. **Note 3**: 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 retroperitoneum. **Note 4**: The assignment of the T1 category for neuroendocrine tumors (NET) of the small intestine 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, 210, 410, and 810 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 5**: Use code 300 for localized tumor only if no information is available to assign code 100, 110, 120. 160, 170, 200 or 210,

Default

999

NAACCR Item

NAACCR #2810

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, noninvasive	TX	Tis	IS	IS
100	Invasive tumor confined to mucosa, NOS, including intramucosal, NOS	Extension Size AJCC7	T1	L	L
110	Invades lamina propria, including lamina propria in a polyp	Extension Size AJCC7	T1	L	L
120	Confined to and not through the muscularis mucosae, including muscularis mucosae in a polyp	Extension Size AJCC7	T1	L	L
130	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Confined to head of polyp	Extension Size AJCC7	T1	L	L
140	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Confined to stalk of polyp	Extension Size AJCC7	T1	L	L
150	OBSOLETE DATA RETAINED AND REVIEWED V0203 See codes 110, 120, 160 Invasion of polyp, NOS	Extension Size AJCC7	T1	L	L
160	Invades submucosa (superficial invasion) including submucosa in a polyp	Extension Size AJCC7	T1	L	L
170	Stated as T1 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 Intraluminal spread to other segments of small intestine or cecum	Extension Size AJCC7	T1	L	L
400	Invasion through muscularis propria or muscularis, NOS Extension through wall, NOS Subserosal tissue/(sub)serosal fat invaded Transmural, NOS	T3	T3	L	L
410	Stated as T3 with no other information on extension	T3	T3	RE	RE
420	OBSOLETE DATA CONVERTED V0203 See code 458 Fat, NOS	ERROR:	ERROR:	ERROR:	ERROR:
450	OBSOLETE DATA RETAINED V0200 See codes 460-470 and 560 Adjacent connective tissue Mesentery, including mesenteric fat, invaded less than or equal to 2 cm in depth or NOS Nonperitonealized perimuscular tissue invaded less than or equal to 2 cm in depth or NOS Retroperitoneum invaded less than or equal to 2 cm in depth or NOS	ERROR:	T3	RE	RE
458	Fat, NOS	T3	T3	RE	RE
460	OBSOLETE DATA REVIEWED V0203 See codes 465, 485 Adjacent connective tissue Mesentery, including mesenteric fat Perimuscular tissue	T3	T3	RE	RE
465	Adjacent connective tissue Mesentery, including mesenteric fat less than or equal to 2 centimeters (cm) in depth or NOS Nonperitonealized perimuscular tissue less than or equal to 2 cm in depth or NOS	T3	T3	RE	RE
470	OBSOLETE DATA REVIEWED V0203 See codes 475, 488 For duodenum primary only: Retroperitoneum	T3	T3	RE	RE
475	For duodenum primary only: Retroperitoneum less than or equal to 2 cm in depth or NOS	T3	T3	RE	RE
480	For duodenum primary only: Ampulla of Vater Pancreas Pancreatic duct	T3	T3	RE	RE
485	Mesentery invaded greater than 2 cm in depth Nonperitonealized perimuscular tissue invaded greater than 2 cm in depth	T3	T4	RE	RE
488	For duodenum primary only: Retroperitoneum invaded greater than 2 cm in depth	T3	T4	RE	RE
500	Invasion of/through serosa(mesothelium)(tunica serosa) (visceral peritoneum)	T4	T4	L	RE
550	OBSOLETE DATA RETAINED V0200 (500) + [(420) or (450)]	T4	T4	RE	RE
560	OBSOLETE DATA CONVERTED V0203 See code 565 (500) + [(420) or (460) or (470) or (480)]	ERROR:	ERROR:	ERROR:	ERROR:
565	500 + (458, 465, 475, 480, 485, or 488)	T4	T4	RE	RE
600	OBSOLETE DATA RETAINED V0200 See codes 480 and 610 For duodenum primary only: Ampulla of Vater Diaphragm Extrahepatic bile ducts Gallbladder Pancreas Pancreatic duct	ERROR:	T4	RE	RE
610	For duodenum primary only: Diaphragm Extrahepatic bile ducts Gallbladder	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
665	(610, 650, 660) + (485, 488)	T4	T4	RE	RE
670	OBSOLETE DATA RETAINED V0200 For all small intestine sites: Abdominal wall Mesentery invaded greater than 2 cm in depth Non-peritonealized perimuscular tissue invaded greater than 2 cm in depth Retroperitoneum invaded greater than 2 cm in depth	T4	T4	RE	RE
675	For all small intestine sites: Abdominal wall	T4	T4	RE	RE
678	For jejunum or ileum primary only: Retroperitoneum invaded greater than 2cm 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 810 Stated as T4[NOS] with no other information on extension	ERROR:	ERROR:	ERROR:	ERROR:
700	For jejunum or ileum primary only: Bladder Fallopian tube Ovary Uterus	T4	T4	D	D
800	Further 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 100-170, and 300 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size A JCC 7 Table for this schema.