A meningioma is a type of tumor that forms in the protective membranes, called the meninges, surrounding the brain and spinal cord. These tumors are usually benign, meaning they are not cancerous, and grow slowly. Meningiomas can occur in various locations and may cause symptoms depending on their size and position, such as headaches, seizures, or vision problems. Diagnosis typically involves imaging tests like MRI or CT scans. Treatment options may include monitoring, surgery, or radiation therapy, depending on the tumor's characteristics and the patient's overall health. Most people with meningiomas have a good prognosis, especially if the tumor is removed successfully.