Hello. I also discovered I had a Meningioma about 3 years ago by accident). Apparently it showed up in X-rays back in 2006 and I was never told about it! Anyway, when it reach 6mm I had Gamma Knife. Everything went smoothly. It was quite an experience. It’s amazing walking into the hospital at 6am and walking out at 3:30pm. I had the procedure at University of Pennsylvania. They were amazing. I had the same nurse by my side the whole time. The only thing that was an ick factor, was having a halo screwed into my head to make sure that my head didn’t move during the procedure. I was under anesthesia so I didn’t feel a thing. They took if off before I left. No problem. My surgeon told me the Gamma Knife should keep the tumor from growing, and hopefully it will shrivel as time goes by. Good luck. I have a check up at my 1-1/2 year mark. Good luck.