CS Extension

Notes

**Note 1**: Islets of Langerhans are distributed throughout the pancreas; an islet tumor is coded to the subsite of the pancreas in which the tumor arises if the information is available. **Note 2**: Codes 400-780 are used for contiguous extension of tumor from the site of origin. Discontinuous involvement is coded in CS Mets at DX. **Note 3**: The assignment of T1 and T2 categories for tumors of the pancreas is based on tumor size. A physician's statement of the T category may be used to code 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, other than the physician's statement of the T category. Use codes 150 and 200 as appropriate to code CS Extension based on a statement of T when no other extension information is available.

Code	Description	AJCC 7 T	AJCC 6 T	Summary Stage 1977 T	Summary Stage 2000 T
000	In situ, intrapethelial, noninvasive Pancreatic intraepithelial neoplasia III (PanInIII)	Tis	Tis	IS	IS
100	Confined to pancreas	Extension Size	Extension Size	L	L
150	Stated as T1 with no other information on extension	Extension Size	Extension Size	L	L
200	Stated as T2 with no other information on extension	Extension Size	Extension Size	L	L
300	Localized, NOS	Extension Size	Extension Size	L	L
400	Peripancreatic tissue	T3	T3	RE	RE
420	OBSOLETE DATA CONVERTED V0203 See code 510 Stated as T3, NOS	ERROR:	ERROR:	ERROR:	ERROR:
450	Ampulla of Vater Duodenum Extra hepatic bile duct(s)	T3	T3	RE	RE
500	Adjacent large vessel(s) (except as listed in code 600) Colon Spleen Stomach	T3	T3	RE	RE
510	Stated as T3 with no other information on extension	T3	T3	RE	RE
600	Tumor is inseparable from the celiac axis or superior mesenteric artery Aorta Celiac artery Superior mesenteric artery	T4	T4	RE	RE
790	OBSOLETE DATA CONVERTED V0203 See code 810 Stated as T4, NOS	ERROR:	ERROR:	ERROR:	ERROR:
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, 150, 200, 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 Table for this schema. - For CS Extension codes 100, 150, 200, and 300 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size Table for this schema.