EOD Primary Tumor

Notes

**Note 1:** The cystic duct extends from the neck of the gallbladder to its junction with the common hepatic duct, to form the common bile duct. **Note 2:** Involvement within the porta hepatis is coded according to the structures involved: portal vein, common hepatic artery, and common hepatic duct.
Code Description SS2018 T
000 In situ, intraepithelial, noninvasive IS
100 Invasive tumor confined to - Lamina propria - Mucosa, NOS - Submucosa (superficial invasion) L
150 Code 100 plus any involvement of gallbladder RE
200 Muscularis propria (layer) L
250 Code 200 plus any involvement of gallbladder RE
300 Confined to cystic duct, NOS Localized, NOS L
400 Perimuscular connective tissue (peritoneal side) - WITHOUT involvement of serosa (visceral peritoneum) Peritoneal side of gallbladder RE
450 Perimuscular connective tissue (hepatic side) - WITH no extension into liver Hepatic side of gallbladder RE
500 Beyond wall of cystic duct Perimuscular tissue, NOS UNKNOWN if gallbladder or liver involved RE
550 Extrahepatic bile ducts (including common bile duct) L
600 Extrahepatic bile ducts (including common bile duct) with extension to gallbladder or structures in codes 400-500 OR ONE of the following organs or structures + Ampulla of Vater + Colon + Duodenum, NOS + Invasion of/through serosa + Liver + Omentum, greater or lesser + Pancreas + Periductal/perimuscular connective tissue + Serosa (visceral peritoneum) perforated + Small intestine, NOS + Stomach, distal or proximal + Unilateral branches of hepatic artery (right or left) + Unilateral branches of portal vein (right or left) RE
650 Two or more organs and/or structures listed in code 600 Hepatic artery (common, NOS) Portal vein (main, NOS) RE
700 Abdominal wall 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) (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) Zhu, A.X., Pawlik, T.M., Vauthey, J.N., et al. **Gallbladder**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017