EOD Primary Tumor

Code	Description	SS2018 T
050	Benign or borderline brain	B
100	Confined to tissue or site of origin Localized, NOS	L
500	Adjacent connective/soft tissue Adjacent muscle Bone (skull) (See code 700 for other bone involvement) Brain for cranial nerve tumor(s) (See code 700 for sites other than cranial nerve tumors) Major blood vessel(s) Meningeal tumor infiltrates nerve Nerve tumor infiltrates meninges (dura) Sphenoid and frontal sinuses (skull)	RE
700	Bone other than skull (see code 400 for skull) Brain except for cranial nerve tumor(s) (See code 400 for cranial nerve tumors) Eye 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) Laws, E.R., Curran, W.J., et al. **Brain and Spinal Cord**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017