CS Extension

Notes

**Note 1**: As stated in the AJCC 7th Edition, p. 419, a primary peritoneal carcinoma may not involve the ovaries or only involve the ovaries "with minimal surface implants. The clinical presentation, surgical therapy, chemotherapy, and prognosis of these peritoneal tumors mirror those of papillary serous carcinoma of the ovary. Patients who undergo prophylactic oophorectomy for a familial history of ovarian cancer appear to retain a 1 to 2% chance of developing peritoneal adenocarcinoma, which is histopathologically and clinically similar to primary ovarian cancer." **Note 2**: When both the Federation Internationale de Gynecologie et d'Obstetrique (FIGO) stage and extension detail are available, record the code with extension detail in preference to a statement of FIGO stage. FIGO Stage IIIC is assigned based on tumor extension and/or regional lymph node involvement. Code CS Extension based on a physician's statement of FIGO Stage IIIC if it is known that the stage value is assigned because of tumor extension or if the basis is unknown. **Note 3**: For most histologies the T category for AJCC 6 staging is assigned as NA.

Code	Description	AJCC 7 T	AJCC 6 T	Summary Stage 1977 T	Summary Stage 2000 T
100	OBSOLETE DATA RETAINED V0200 Tumor confined to site of origin	ERROR:	Extension Size	L	L
150	Microscopic peritoneal implants beyond pelvis including: Liver capsule Mesentery Omentum Pericolic gutter Microscopic peritoneal implants beyond pelvis including peritoneal surface/capsule of: Ascending colon Descending colon Diaphragm Esophagus Gallbladder Transverse colon and flexures Small intestine Spleen Stomach WITHOUT invasion of underlying structures	T3a	Extension Size	L	L
180	FIGO Stage IIIA	T3a	Extension Size	L	L
300	OBSOLETE DATA RETAINED V0200 Localized, NOS	ERROR:	Extension Size	L	L
400	OBSOLETE DATA RETAINED V0200 Adjacent connective tissue see definition of adjacent connective tissue in General Instructions.	ERROR:	Extension Size	RE	RE
510	Macroscopic peritoneal implants beyond pelvis less than or equal to 2 centimeter (cm) in diameter including: Liver capsule Mesentery Omentum Pericolic gutter Macroscopic peritoneal implants beyond pelvis less than or equal to 2 cm in diameter: Ascending colon Descending colon Diaphragm Esophagus Gallbladder Transverse colon and flexures Small intestine Spleen Stomach WITHOUT invasion of underlying structures	T3b	Extension Size	RE	RE
520	Macroscopic peritoneal implants beyond pelvis less than or equal to 2 cm in diameter: Adjacent connective tissue Diaphragm Esophagus Gallbladder Transverse colon and flexures Liver Small intestine Spleen Stomach WITH invasion of underlying structures	T3b	Extension Size	RE	RE
530	Macroscopic peritoneal implants beyond pelvis less than or equal to 2 cm in diameter: Ascending colon Descending colon WITH invasion of underlying structures	T3b	Extension Size	D	D
580	FIGO Stage IIIB	T3b	Extension Size	RE	RE
600	OBSOLETE DATA RETAINED V0200 Adjacent organs/structures including bone/cartilage Retroperitoneum: Adrenal(s) (suprarenal gland(s)) Aorta Ascending colon Descending colon Kidney(s) Pancreas Vena cava Vertebra Peritoneum: Colon (except ascending and descending colon) Esophagus Gallbladder Liver Small intestine Spleen Stomach	ERROR:	Extension Size	RE	RE
610	Macroscopic peritoneal implants beyond pelvis greater than 2 cm in diameter including: Liver capsule Mesentery Omentum Pericolic gutter Macroscopic peritoneal implants beyond pelvis greater than 2cm in diameter: Adjacent connective tissue Diaphragm Esophagus Gallbladder Transverse colon and flexures Small intestine Spleen Stomach WITHOUT invasion of underlying structures	T3c	Extension Size	L	L
620	610 + 520	T3c	Extension Size	RE	RE
630	610 + 530	T3c	Extension Size	D	D
640	Macroscopic peritoneal implants beyond pelvis greater than 2cm in diameter: Diaphragm Esophagus Gallbladder Transverse colon and flexures Liver Small intestine Spleen Stomach WITH invasion of underlying structures	T3c	Extension Size	RE	RE
650	640 + (530 or 630)	T3c	Extension Size	D	D
660	Macroscopic peritoneal implants beyond pelvis greater than 2cm in diameter: Ascending colon Descending colon WITH invasion of underlying structures	T3c	Extension Size	D	D
700	OBSOLETE DATA CONVERTED V0203 See code 150 Microscopic peritoneal implants beyond pelvis, including peritoneal surface/capsule of Colon (except ascending and descending colon) Esophagus Gallbladder Liver Small intestine Spleen Stomach	ERROR:	ERROR:	ERROR:	ERROR:
705	OBSOLETE DATA CONVERTED V0203 See code 180 FIGO Stage IIIA	ERROR:	ERROR:	ERROR:	ERROR:
710	OBSOLETE DATA REVIEWED V0203 See codes 510 and 520 Macroscopic peritoneal implants beyond pelvis, less than or equal to 2 cm in diameter, including peritoneal surface of Esophagus Abdominal mesentery Diaphragm Gallbladder Infracolic omentum Kidneys Large intestine except rectum and sigmoid colon Liver (peritoneal surface) Omentum Pancreas Pericolic gutter Small intestine Spleen Stomach Ureters Peritoneum, NOS	T3b	Extension Size	D	D
715	OBSOLETE DATA CONVERTED V0203 See code 580 FIGO Stage IIIB	ERROR:	ERROR:	ERROR:	ERROR:
720	OBSOLETE DATA REVIEWED V0203 See codes 610 and 620 Peritoneal implants beyond pelvis, greater than 2 cm in diameter, including peritoneal surface of Esophagus Abdominal mesentery Diaphragm Gallbladder Infracolic omentum Kidneys Large intestine except rectum and sigmoid colon Liver (peritoneal surface) Omentum Pancreas Pericolic gutter Small intestine Spleen Stomach Ureters Peritoneum, NOS	T3c	Extension Size	D	D
722	Extension to: Bone Cartilage	T3c	Extension Size	RE	RE
725	722 + (530, 660)	T3c	Extension Size	D	D
728	Further contiguous extension	T3c	Extension Size	D	D
730	FIGO Stage IIIC based on tumor extension	T3c	Extension Size	D	D
735	FIGO Stage IIIC unknown if based on tumor extension or nodes	T3c	Extension Size	D	D
750	Peritoneal implants, NOS	T3NOS	Extension Size	L	L
780	FIGO Stage III [NOS]	T3NOS	Extension Size	L	L
785	OBSOLETE DATA REVIEWED V0203 See codes 520 and 610 Adjacent connective tissue (see definition of adjacent connective tissue in General Instructions)	T3NOS	Extension Size	D	D
790	OBSOLETE DATA REVIEWED V0203 See codes 510, 520, 610, 620, and 640 Adjacent organs/structures including bone/cartilage Peritoneum: Colon (except ascending and descending colon) Esophagus Gallbladder Liver Small intestine Spleen Stomach	T3c	Extension Size	D	D
795	OBSOLETE DATA REVIEWED V0203 See codes 150, 530, 630, 650, 660, and 725 Further contiguous extension, including: extension to ascending or descending colon	T3c	Extension Size	D	D
800	OBSOLETE DATA CONVERTED V0203 See code 728 Further contiguous extension	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

- For CS Extension codes 100-700, 710, and 720-795 ONLY, the T category for AJCC 6 staging for certain histologies is assigned based on the value of CS Tumor Size, as shown in the Extension Size Table for this schema.