EOD Primary Tumor

Code	Description	SS2018 T
000	In situ: Noninvasive; intraepithelial	IS
100	Lamina propria Mucosa, NOS Muscularis propria Submucosa (superficial invasion) Confined to bile duct, NOS Localized, NOS	L
200	Ampulla of Vater Beyond wall of bile duct Duodenum Gallbladder - Unilateral branches of the right or left hepatic artery OR portal vein Liver, less than or equal to 2 cm or UNKNOWN Omentum (greater or lesser) Pancreas Perimuscular connective tissue Small intestine Invasion of/through serosa	RE
700	Abdominal wall Colon Common hepatic artery Cystic artery/vein Hepatic artery, NOS Liver greater than 2 cm Portal vein or its branches bilaterally Portal vein, NOS Stomach Further contiguous extension	D
800	No evidence of primary tumor	U
999	Unknown; extension not stated Primary tumor cannot be assessed Not documented in medical record Death Certificate Only	U

(1) Fritz AG, Ries LAG (eds). **SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998)**, National Cancer Institute, NIH Pub. No. 98-2313, Bethesda, MD, 1998 (2) Young JL Jr, Roffers SD, Ries LAG, Fritz AG, Hurlbut AA (eds.). **SEER Summary Staging Manual-2000: Codes and Coding Instructions**, National Cancer Institute, NIH Pub. No. 01-4969, Bethesda, MD, 2001. (3) Collaborative Stage Work Group of the American Joint Committee on Cancer. **Collaborative Stage Data Collection System User Documentation and Coding Instructions, version 02.05**. American Joint Committee on Cancer (Chicago, IL)