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Brain tumors are classified depending on the exact site of the tumor, the type of tissue involved, whether they are noncancerous (benign) or cancerous (malignant), and other factors. Sometimes, tumors that start out being less invasive can become more invasive.

Tumors may occur at any age, but many types of tumors are most common in a certain age group. In adults, gliomas and meningiomas are most common.

Today, most medical institutions use the World Health Organization (WHO) classification system to identify brain tumors.  Some tumor types are assigned a grade, ranging from Grade I (least malignant) to Grade IV (most malignant), which signifies the rate of growth. There are variations in grading systems, depending on the tumor type. The classification and grade of an individual tumor help predict its likely behavior.

Acoustic Neuroma

An acoustic neuroma is a slow-growing tumor of the nerve that connects the ear to the brain.

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Astrocytic tumors include astrocytomas (less malignant), anaplastic astrocytomas, and glioblastomas (most malignant).

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Is a rare and low-grade tumor that occurs at the sacrum, near the lower tip of the spine, or at the base of the skull.

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CNS Lymphoma

CNS Lymphoma is a type of cancer that develops in the lymphatic system.

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craniopharyngioma is a benign tumor that develops near the pituitary gland (a small endocrine gland at the base of the brain).

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Gliomas come from glial cells such as astrocytes, oligodendrocytes, and ependymal cells.

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A type of primitive neuroectodermal tumor (PNET) that is often located in the cerebellum or near the brain stem.

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These tumors grow from the meninges, the layers of tissue covering the brain and spinal cord.

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Metastatic Brain Tumor

A metastatic brain tumor is a cancer that started in another part of the body and spread to the brain.

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This tumor type develops from glial cells called oligodendrocytes.

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Pituitary Tumors

A pituitary tumor is an abnormal growth in the pituitary gland, the part of the brain that regulates the body's balance of hormones.

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A benign nerve sheath tumor composed of Schwann cells, which normally produce the insulating myelin sheath covering peripheral nerves.

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