I had stereotactic radiation 21 years ago for my meningioma. It took time for the tumor to disappear, but over time it did. It still shows on the MRIs for about 5 years, but it was shrinking the entire time. Now it is gone, but I have developed a second one which I am dealing with. This new one was just discovered a few weeks ago, so I haven’t seen a neurosurgeon yet. But non-surgical options can be a better choice. My original doctor didn’t think I’d make it through surgery, so the radiation was my only alternative.