@ninha06, here's more information about gamma knife available in Toronto, Canada, where they have great specialists in brain surgery at the Krembil Barin Institute, part of the University Health Network (UHN) https://www.uhn.ca/Krembil/Clinics/Gamma_Knife

You might also be interested in reading the comments on these related discussions about Gamma knife
https://connect.mayoclinic.org/group/brain-tumor-support-group/?search=gamma+knife#discussion-listview
You might start here:
- - Stereotactic Radiosurgery Surgery (Gamma or Cyberknife) for Meningioma: https://connect.mayoclinic.org/discussion/gamma-knife-radio-surgery-for-meningioma/