It's not to do with insurance. The neurosurgeon is involved because my brother is an airline pilot and their medical people have tried to ascertain the risk of metastase-related seizure whilst flying 400 people around. They want this risk to be less than 1%. They would be happy if it can be demonstrated in other studies rather than the ones cited. They have ALL his MO RO and ENT scans and reports but are asking for guarantees that may be can't be given. I don't have the references cited by the neuropsurgeon but will get them today so thanks for the leads. If anyone can suggest anything else I'd be grateful.