This is good to read. I had a multiple session cyperknife radiation on one visit for an intraventricular menigioma and had no immediate side effects, however as several months later I developed a large amount of sweeling in the area that resulted in a brain shift from the midline and caused some difficult symptoms. Even with the issues of the edema I would highly recommend the Cyperknife radiation to anyone if this is an option, it is a very simple procedure that proved very effective for this particular tumor.