Brain Tumor Frequency
- MC intracranial tumors: Brain Metastases (just over 50%).
- Incidence of primary brain tumors: approximately 20-30 per 100,000 in adults and 5 per 100,000 in children.
- About one third of primary brain tumors in adults are malignant, whereas they account for two thirds in childhood.
- Frequency of WHO subgroups and specific tumors is given (information not provided in the text).
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| Commonest Primary Brain Tumors by WHO Group |
Commonest Primary Brain Tumors by Subtype |
- Meninges (37.6%)
- Neuroepithelial tissue (29.9%)
- Sellar region (16.3%)
- Cranial and spinal nerves (8.1%)
- Unclassified (5.6%)
- Lymphoma and hematopoietic (2.1%)
- Germ cell tumors and cysts (0.4%)
|
- Meningioma (36%)
- Pituitary tumors (15.5%)
- Glioblastoma multiforme (15.1%)
- Nerve sheath tumors (8.1%)
- Diffuse astrocytoma (2.3%)
- Primary CNS lymphoma (2%)
- Ependymal (1.9%)
- Anaplastic astrocytoma (1.7%)
- Pilocytic astrocytoma (1.4%)
- Neuronal and neuronal mixed (1.2%)
- Oligodendroglioma (1.1%)
- Oligoastrocytoma (0.9%)
- Craniopharyngioma (0.8%)
- Anaplastic oligodendroglioma (0.5%)
|