A meningioma is a type of tumor that forms on the membranes that cover the brain and spinal cord, specifically the three layers that are called meninges, according to WebMD. This type of cancer almost always occurs around the brain.
In a majority of cases, a meningioma is benign and considered not cancerous, states WebMD. In fact, many people with meningioma require no immediate treatment and have no symptoms. The danger with this type of cancer occurs when the tumor does begin to grow. Symptoms of this type of meningioma include gradual headaches, blurred vision, speech problems or numbness in the legs. Treatment options usually include surgery or, if the tumor is in an inoperable area, radiation therapy.