A meningioma is a tumor that forms on membranes that cover the brain and spinal cord just inside the skull.
Specifically, the tumor forms on the three layers of membranes that are called meninges.
These tumors are often slow-growing. As many as 90% are benign (not cancerous).
Most meningiomas occur in the brain. But they can also grow on parts of the spinal cord.
Often, meningiomas cause no symptoms and require no immediate treatment. But the growth of benign meningiomas can cause serious problems...