EOD Primary Tumor

Notes

**Note 1:** The wall of the stomach has five layers: mucosal (code 100), submucosal (code 200), muscular (code 400), subserosal (code 500) and serosal (code 600). **Note 2:** Code 400 if the diagnosis states linitis plastica and no other information regarding extension is available. * Linitis plastica is defined as diffuse involvement of the entire thickness of the stomach wall. **Note 3:** Intraluminal or intramural extension to esophagus and duodenum is classified by the depth of greatest invasion in any of these sites, including stomach. (For extension to esophagus or duodenum via serosa, see code 700). **Note 4:** For structures listed in codes 700 and 750, contiguous extension is coded in this field. If there is discontiguous extension of any of these structures, code involvement in EOD Mets.
Code Description SS2018 T
000 In situ, intraepithelial, noninvasive (Adeno)carcinoma, noninvasive, in a polyp IS
100 Intramucosal, NOS Lamina propria Muscularis mucosae Perimuscular tissue invaded Mucosa - WITH or WITHOUT intraluminal extension to esophagus or duodenum L
200 Submucosa (superficial, NOS) - WITH or WITHOUT intraluminal extension to esophagus or duodenum L
300 Confined to polyp (head, stalk, NOS) Implants inside stomach Confined to stomach, NOS Localized, NOS L
400 Muscularis propria (but not through) - WITH or WITHOUT intraluminal extension to esophagus or duodenum Linitis plastica and no other information regarding extension available L
500 Through muscularis propria or muscularis, NOS - WITH or WITHOUT intraluminal extension to esophagus or duodenum Extension through wall, NOS Perimuscular tissue invaded Subserosal tissue/(sub)serosal fat invaded L
600 Extension to adjacent (connective) tissue - WITHOUT perforation of visceral peritoneum covering these structures Gastric artery Ligaments - Gastrocolic - Gastrohepatic - Gastrosplenic Omentum (greater, lesser, NOS) Perigastric fat RE
650 Mesothelium Serosa Tunica serosa Visceral peritoneum RE
700 Colon/mesocolon (including transverse and flexures) Diaphragm Duodenum (via serosa) Esophagus (via serosa) Ileum Jejunum Liver Pancreas Small intestine, NOS Spleen RE
750 Abdominal wall Adrenal (suprarenal) gland Aorta Celiac axis Kidney Retroperitoneum 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) Ajani, J.A., In, H., Sano, T., Hofstetter, W.L., et al. **Stomach**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017