A meningioma brain tumor is a tumor that arises from meninges, which are the membranes that surround the brain and spinal cord, according to WebMD. Although meningiomas mostly grow in the brain, they can also occur in the spinal cord.
Meningiomas are more common in women than in men and are rare in children, notes WebMD. About 90 percent of meningiomas are noncancerous, and they grow at a slower pace than cancerous meningiomas, which are smaller in number and grow faster. Aside from attacking the central nervous system, cancerous meningiomas can also spread to other parts of the body, especially the lungs.
Although the causes of a meningioma brain tumor are unclear, the known risk factors include exposure to radiation and neurofibromatosis type 2, which is a genetic disorder, explains WebMD. Previous injuries may also expose an individual to meningioma. This is due to the cases of meningiomas appearing in the fractured skull and scarred surrounding membrane.
The symptoms of a meningioma brain tumor develop gradually because most meningiomas have a slow growth rate, says WebMD. The common ones include headaches, blurred vision, arm or leg weakness, speech difficulties and numbness. In most cases, these symptoms precede diagnosis of the meningioma brain tumor and may necessitate a brain surgery to remove the tumor.