EOD Primary Tumor

Code Description SS2018 T
000 In situ: Noninvasive; intraepithelial IS
100 Tumor less than or equal to 1 cm AND confined to - Intramucosal, NOS - Lamina propria (including in a polyp) - Mucosa, NOS - Muscularis mucosae (including in a polyp) - Submucosa (superficial invasion) (including in a polyp) Localized, NOS L
200 Tumor greater than 1 cm OR Invades muscularis propria L
300 Extension through wall, NOS Invasion through muscularis propria or muscularis, NOS Subserosal tissue/(sub)serosal fat invaded Transmural, NOS Wall, NOS L
400 Adjacent (connective) tissue(s), NOS (without serosal penetration) Ampulla of Vater Fat, NOS Mesenteric fat Mesentery (adjacent loops of bowel) Nonperitonealized perimuscular tissue Pancreas Pancreatic duct Retroperitoneum RE
600 Invasion of/through serosa (mesothelium) (tunica serosa) (visceral peritoneum) Blood vessel(s) (major) - Common hepatic artery - Portal vein - Superior mesenteric artery Celiac (axis) artery Colon (hepatic flexure, transverse colon) Common bile duct Extrahepatic bile duct(s) Gallbladder Liver, including porta hepatis Omentum (lesser) Stomach (distal, proximal, NOS) RE
700 Further contiguous extension D
800 No evidence of primary tumor U
999 Unknown extension 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) (4) Gress, D.M., Edge, S.B., Gershenwald, J.E., et al. **Principles of Cancer Staging**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017 (5) Bergsland, E.K., Woltering, E.A., Klimstra, D.S., et al. **Neuroendocrine Tumors of the Duodenum and Ampulla of Vater**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017 (6) **Neuroendocrine Tumors of the Duodenum and Ampulla of Vater,** from the AJCC Cancer Staging System Version 9 (2023). Used with permission of the American College of Surgeons, Chicago, Illinois.