EOD Primary Tumor

Notes

**Note 1:** Parathyroid tumors are defined as left or right and superior (upper) or inferior (lower). **Note 2:** Atypical parathyroid neoplasms (code 050) are defined as tumors that are histologically or clinically worrisome but do not fulfill the more robust criteria [i.e., invasion metastasis] for carcinoma.

Code	Description	SS2018 T
000	In situ, intraepithelial, noninvasive	IS
050	Atypical parathyroid neoplasm (neoplasm of uncertain malignant potential)	IS
100	Confined to parathyroid Extension to soft tissue Localized, NOS	L
200	Invasion into thyroid gland	RE
300	Adjacent lymph node(s) Esophagus Recurrent laryngeal nerve Thymus Trachea Skeletal muscle	RE
700	Major blood vessels Spine 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) Landry, C.S., Wang, T.S., Perrier, N.D., et al. **Parathyroid**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017