EOD Primary Tumor
Notes
**Note 1:** The tentorium cerebelli is an extension of the dura mater that separates the cerebellum from the inferior portion of the occipital lobes. The location of the tumor above or below the tentorium can help in determining the type of tumor; also most adult brain tumors are supratentorial, and most pediatric brain tumors are infratentorial. In the following list, note that ICD-O-3 codes C71.0 and C71.9 include both supratentorial and infratentorial subsites.
**Infratentorial sites by ICD-O-3 codes**
C710: Hypothalamus, pallium, thalamus
C716-C717
**Supratentorial sites by ICD-O-3 codes**
C710, except hypothalamus, pallium, thalamus
C711-C715
C718: Corpus callosum, tapetum
C719: Anterior cranial fossa, middle cranial fossa, suprasellar
**Note 2:** Discontiguous spread, including circulating cells in cerebrospinal fluid (CSF), is coded in EOD Mets.
| Code |
Description |
SS2018 T |
| 050 |
Benign or borderline brain tumor |
B |
| 100 |
Infratentorial tumor confined to
- Brain stem or meninges of brain stem (one side)
+ Medulla oblongata
+ Midbrain (mesencephalon)
+ Pons
- Cerebellum or meninges of cerebellum (one side or midline)
+ Lateral lobes
+ Median lobe of cerebellum
+ Vermis
- Hypothalamus
- Thalamus
Infratentorial tumor
- Both cerebellum and brain stem involved with tumor on one side
Supratentorial tumor confined to
- Cerebral hemisphere (cerebrum) or meninges of cerebral hemisphere (one side)
+ Frontal lobe
+ Occipital lobe
+ Parietal lobe
+ Temporal lobe
Confined to ventricles
Tumor invades or encroaches upon ventricular system
Confined to brain, NOS
Confined to meninges, NOS |
L |
| 500 |
Tumor crosses the midline
Bone (skull)
Contralateral hemisphere
Corpus callosum (including splenium)
Major blood vessel(s)
Meninges (e.g., dura)
Nerves (cranial, NOS)
Spinal cord/canal
Supratentorial tumor extends infratentorially to involve
- Brain stem
- Cerebellum
- Hypothalamus
- Pallium
- Posterior cranial fossa
- Thalamus
Infratentorial tumor extends supratentorially to involve
- Cerebrum (cerebral hemisphere) (excluding hypothalamus, pallium, thalamus)
- Anterior cranial fossa
- Corpus callosum
- Middle cranial fossa
- Suprasellar brain
- Tapetum |
RE |
| 700 |
Circulating cells in cerebral spinal fluid (CSF)
Nasal cavity
Nasopharynx
Other direct extension outside CNS
Posterior pharynx
Further contiguous extension |
D |
| 800 |
No evidence of primary tumor |
U |
| 999 |
Unknown; extension not stated
Primary tumor cannot be assessed
Not documented in patient 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: 857-869
