Causes Of Brain Tumor

Brain tumors that begin in the brain

Primary brain tumors originate in the brain itself or in the tissue close to her, like the brain, covering membranes (meninges), cranial nerves, the pituitary and pineal. Primary brain tumors begin when normal cells acquire defects (mutations) in their DNA. These mutations allow cells to grow and divide a rate increase and continue to live, when healthy cells would die. The result is a mass of abnormal cells that forms a tumor.

Primary brain tumors are much rarer than they are of secondary brain tumors, where the cancer starts elsewhere and spreads to the brain. A wide range of primary brain tumors exist. Each is named after the type of cell involved. Examples include:

Acoustic neuroma (schwannoma)

Astrocytoma, also known as gliomas, including anaplastic astrocytoma and glioblastoma

Ependymoma

Ependymoblastoma

Germ cell tumor

Medulloblastoma

Meningioma

Neuroblastoma

Oligodendroglioma

Pineoblastoma

Cancer that spreads to the brain and elsewhere

The secondary (metastatic) brain tumors are cancers arising from a cancer that begins in other parts of the body and then spread (metastasize) to the brain. Secondary brain tumors usually occur in people who have had cancer. But in rare cases, metastatic brain tumor may be the first sign of cancer that began elsewhere in the body.

Secondary brain tumors are much more common than are primary brain tumors. Any cancer can spread to the brain, but the most common types include:

Breast cancer

Colon cancer

Kidney cancer

Lung Cancer

Melanoma