The meninges are a protective lining around the brain and spinal cord. A meningioma is a tumor of these linings. Most meningiomas do not cause symptoms. But, if the meningioma grows, it can push on important parts of the brain. These tumors may be grade I, II, or III.

Grade III is the most aggressive type. Malignant meningiomas, also called anaplastic, are less common. These tumors are faster growing and very likely to return.

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The exact cause of meningiomas is unknown. Factors that may be associated with these tumors include:

  • Genetic factors
  • Certain hormones