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Brain tumors: Clinical
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Brain tumors are broadly classified into primary tumors originating from cells within the central nervous system, and metastatic tumors originating from cells outside the central nervous system.
Primary brain tumors are the most common solid tumors in children, while metastatic tumors are more common in adults.
In adults, gliomas are followed by meningiomas, and in children, medulloblastomas and ependymomas are next on the list. These are followed by the less common schwannomas, oligodendrogliomas, craniopharyngioma, choroid plexus tumors, germinomas, hemangioblastomas, and primary central nervous system lymphoma.
Also, in children, most brain tumors are located below the cerebellar tentorium, or are infratentorial. Whereas in adults, most brain tumors are above it, or are supratentorial. Just remember that adults are taller than children.
The main environmental risk factor for brain tumors is exposure to ionizing radiation, which can come from therapeutic radiotherapy for cancer, or diagnostic imaging like CT scans.
Electromagnetic radiation from cell phones and microwaves is currently being researched as potential risk factors in humans.
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