CS Extension

This input is used for staging

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. * Supratentorial sites by ICD-O-3 codes: * C71.0, except hypothalamus, pallium, thalamus * C71.1-C71.5 * C71.8: Corpus callosum, tapetum * C71.9: Anterior cranial fossa, middle cranial fossa, suprasellar * Infratentorial sites by ICD-O-3 codes: * C71.0: Hypothalamus, pallium, thalamus * C71.6-C71.7 * C71.9: Posterior cranial fossa **Note 2**: If discontiguous spread is limited to circulating cells in cerebrospinal fluid (CSF), use code 710 in CS Extension. Code all other discontiguous spread in CS Mets at DX.

Default

999

NAACCR Item

NAACCR #2810
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
050 Benign or borderline brain tumor NA NA NA NA
100 Supratentorial tumor confined to:
Cerebral hemisphere (cerebrum) or meninges of cerebral hemisphere (one side):
Frontal lobe
Occipital lobe
Parietal lobe
Temporal lobe
NA NA L L
110 Infratentorial tumor confined to cerebellum or meninges of cerebellum (one side or midline):
Vermis
Lateral lobes
Median lobe of cerebellum
NA NA L L
120 Infratentorial tumor confined to:
Brain stem or meninges of brain stem (one side):
Medulla oblongata
Midbrain (mesencephalon)
Pons
Hypothalamus
Thalamus
NA NA L L
150 Confined to brain, NOS
Confined to meninges, NOS
NA NA L L
200 Infratentorial tumor:
Both cerebellum and brain stem involved with tumor on one side
NA NA L L
300 Confined to ventricles
Tumor invades or encroaches upon ventricular system
NA NA L L
400 Tumor crosses the midline
Tumor involves contralateral hemisphere
Tumor involves corpus callosum (including splenium)
NA NA RNOS RNOS
500 Supratentorial tumor extends infratentorially to involve:
Cerebellum
Brain stem
Hypothalamus
Pallium
Posterior cranial fossa
Thalamus
NA NA RNOS RNOS
510 Infratentorial tumor extends supratentorially to involve:
Cerebrum (cerebral hemisphere) (excluding hypothalamus, pallium, thalamus)
Anterior cranial fossa
Corpus callosum
Middle cranial fossa
Suprasellar brain
Tapetum
NA NA RNOS RNOS
600 Tumor invades:
Bone (skull)
Major blood vessel(s)
Meninges (e.g., dura)
Nerves, NOS
Cranial nerves
Spinal cord/canal
NA NA RNOS RNOS
700 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 100-600 and 710, CS Mets at DX code 20

Circulating cells in cerebral spinal fluid (CSF)
Nasal cavity
Nasopharynx
Posterior pharynx
Direct extension outside central nervous system (CNS)
NA NA D D
710 Circulating cells in cerebral spinal fluid (CSF) NA NA D D
750 Extension to:
Nasal cavity
Nasopharynx
Posterior pharynx
Other direct extension outside CNS
NA NA D D
800 Further contiguous extension NA NA D D
950 No evidence of primary tumor NA NA U U
999 Unknown; extension not stated
Primary tumor cannot be assessed
Not documented in patient record
NA NA U U