He should have been scanned at the three month mark. If not then for sure at six months... How do they know whether it has spead or if there are and hot spots to keep an eye on? Some one will correct me if I'm wrong but I believe that 3 months post surgery a scan is the standard, then from that point on it varies, depending on dr. And hospital protocol. His seizures could be related to the radiation, I'm not sure what angle they set the machine at but I'm sure there's a certain amount of spray radius that hits beyond the designated area. I've personally not had trouble with seizures - but I would maybe film it the next time and make an appointment to see another dr. Particularly if this one/group isn't listening. It could also be related to chemo, though technically only certain chemos are supposed to cross the blood brain barrier (protective mechanism within your body that prevents damaging substances from getting to your brain). I wouldn't wait too long to have this checked out, and most importantly push for a scan. Good luck!