It depneds: Tumors can arise in the brain or can spread to brain from outside Cancers (like Lung Cancer can spread to brain). These can also be benign like a Pituitary Adenoma. When cancerous, the primary brain tumors are called Gliomas. One of the common ones is called Glioblastoma multiforme(GBM)
Answered 10/26/2015
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Additional comments: We do not know why primary tumors of brain occur, but many are quite benign, such as meningiomas. Secondary cancerous tumors d0 occur associated with lung, breast, skin, GI, and kidney cancers.
Answered 10/31/2015
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