I have an acoustic neuroma. It's about 1.7 cm. I recently had stereotactic radiosurgery which is a type of radiation for acoustic neuroma. I had that in May of this year. It was only one session and it only lasted about 6 minutes. I get an MRI done in August and then I see the doctor for a follow-up the next week. So I can't tell you whether or not it's been successful or not because there has been no measurement as yet and I'm still dealing with the side effects.