EOD Primary Tumor

This input is used for staging


**Note 1:** The cortex of a bone is the dense outer shell that provides strength to the bone; the spongy center of a bone is the cancellous portion. The periosteum of the bone is the fibrous membrane covering of a bone that contains the blood vessels and nerves; the periosteum is similar to the capsule on a visceral organ. **Note 2:** The number of vertebral segments involved by the primary tumor determines the appropriate EOD Primary Tumor (codes 100 through 400). The five vertebral segments used in these codes are: • Body (left) • Body (right) • Pedicle (left) • Pedicle (right) • Posterior element




Code Description SS2018 T
100 Involvement of one vertebral segments L
200 Involvement of two adjacent vertebral segments L
300 Involvement of three adjacent vertebral segments L
400 Involvement of four or more adjacent vertebral segments L
450 Confined to spine, NOS (number of segments involved not known) Localized, NOS L
500 Involvement of nonadjacent vertebral segments RE
650 Spinal canal RE
700 Gross vascular invasion Tumor thrombus in great vessels D
750 Extension beyond periosteum to surrounding tissues, including adjacent skeletal muscle(s) RE
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) Kneisl, J.S., Rosenberg, A.E., et al. **Bone**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017