First, hopefully you have consulted with a neurologist and not just your primary care physician. Secondly, did the physician who ordered the scan state that the headaches are most likely a symptom of the meningioma, or a separate issue, not related to the meningioma. I ask this because I was told that if a meningioma is causing symptoms (like a headache, vision changes, etc.) then you should be a little more aggressive figuring out what to do rather than just annual monitoring.