Summary Stage 2018: Thymus
Summary Stage 2018
Notes
**Thymus**
8000-8700, 8720-8790, 8940-8960, 8965-8983, 9000, 9050-9111, 9270, 9300-9312, 9340-9363, 9380-9539, 9541
C379: Thymus
**Note 1:** **Sources used in the development of this chapter**
* SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998) (https://seer.cancer.gov/archive/manuals/EOD10Dig.3rd.pdf)
* SEER Summary Staging Manual-2000: Codes and Coding Instructions (https://seer.cancer.gov/tools/ssm/ssm2000/)
* Collaborative Stage Data Collection System, version 02.05: https://cancerstaging.org/cstage/Pages/default.aspx
* Chapter 35 *Thymus*, in the AJCC Cancer Staging Manual, Eighth Edition (2017) published by Springer International Publishing. Used with permission of the American College of Surgeons, Chicago, Illinois.
**Note 2:** **Other Summary Stage Chapters with Thymus sites**
* **GIST**: 8935-8936
* **Kaposi Sarcoma**: 9140
* **Mycosis Fungoides**: 9700-9701
* **Soft Tissue**: 8710-8714, 8800-8934, 8963-8964, 8990-8992, 9010-9045, 9120-9138, 9141-9262, 9271-9290, 9320-9330, 9364-9373, 9540, 9542-9582
| SS2018 |
Description |
| 0 |
**In situ: noninvasive, intraepithelial** |
| 1 |
**Localized only (localized, NOS)**
* Confined to thymus, NOS
- WITH or WITHOUT extension into mediastinal fat
* No mediastinal or pleura involvement or UNKNOWN if involved |
| 2 |
**Regional by direct extension only**
* Brachiocephalic vein
* Chest wall
* Confined to thymus WITH mediastinal or pleural involvement
* Direct invasion of pericardium
* Extrapericardial pulmonary artery or vein
* Lung
* Phrenic nerve
* Superior vena cava |
| 3 |
**Regional lymph node(s) involved only**
* Ascending aorta
* Cervical (low anterior)
* Hilar
* Internal mammary
* Lower jugular
* Mediastinal (lower, middle, NOS)
* Para-aortic
* Paratracheal (lower, upper, NOS)
* Peri-thymic
* Peri-thyroid
* Pericardial
* Phrenic (inferior, superior)
* Precricoid/delphian
* Pretracheal
* Prevascular
* Subaortic/aortopulmonary window
* Subcarinal
* Supraclavicular/venous angle: confluence of internal jugular and subclavian vein
* Regional lymph node(s), NOS
- Lymph node(s), NOS |
| 4 |
**Regional by BOTH direct extension AND regional lymph node(s) involved**
* Codes (2) + (3) |
| 7 |
**Distant site(s)/lymph node(s) involved**
* Distant site(s) (including further contiguous extension)
- Extrathoracic sites
- Separate pleural or pericardial nodule(s)
* Distant lymph node(s), NOS
* Distant metastasis, NOS
- Carcinomatosis
- Distant metastasis WITH or WITHOUT distant lymph node(s)
+ OR with pleural or pericardial nodule(s) metastasis |
| 9 |
Unknown if extension or metastasis |
(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) Detterbeck, F.C., Marom, E.M. **Thymus**. In: Amin, M.B., Edge, S.B., Greene, F.L., et al. (Eds.) AJCC Cancer Staging Manual. 8th Ed. New York: Springer; 2017
(6) **Thymus**, from the AJCC Cancer Staging System Version 9 (2024). Used with permission of the American College of Surgeons, Chicago, Illinois.
