Hi my son 25 years old was diagnosed with a necrosis on his brain its swollen and have some pain he got a stereotactic Radiation procedure and after a year he got the surgery all because he had an AVM he was on steroids before for a prior necrosis after the radiation and before the surgery now again he has necrosis after almost 3 years what do you think this is happening all his life this necrosis is going to come back and forth I do not understand. He is an A student on his college and work as a tutor there he saw his Neurosurgeon and he told him that he has 2 options start again with steroids or take Avastin pills for cancer my question is why my son has to take those pills he does not have cancer what we can do why tis this happening maybe was too much radiation I do not know what to think. he was ok doing his normal life. Please help me I need your advise. Thank you very much.