Radiation necrosis from radiaton treatment

dls

My husband has a rare tumor called ganglioglioma in left temporal lobe area. He has had 2 surgeries and done great. This last surgery required chemo and radiation and now the radiation has caused necrosis.
He now has speech and reading problems. He had his first round of avastin. Anyone out there ever had this type tumor or dealt with radiation necrosis. Would love to hear from someone. Thanks.