Meningiomas arise from the arachnoid matter, one of the layers of the meninges that line the brain. These tumors account for about 27% of all primary brain tumors, and are seen most frequently in middle-aged women. The majority of meningiomas are benign, slow-growing tumors that are localized and noninfiltrating.
A good primer on brain tumors can be found at the web site of the American Brain Tumor Association (www.abta.org).
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