EOD Primary Tumor

Code	Description	SS2018 T
000	In situ, intraepithelial, noninvasive	IS
100	Invasive tumor confined to trachea Localized, NOS	L
200	Adjacent connective tissue * Arch of aorta * Azygos vein, right * Brachiocephalic vein * Carotid sheath * Common carotid artery(ies) * Jugular arch * Phrenic nerves * Pretracheal fascia * Recurrent laryngeal nerve * Subclavian artery(ies) * Vagus nerve Adjacent organ(s)/structure(s) * Cricoid cartilage * Esophagus * Pleura, NOS - Parietal - Visceral * Right and left main bronchi * Sternum * Thymus * Thyroid gland * Vertebral column	RE
700	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)