replacement of head plate

[ninnee]

My husband is 46 yrs old and has a titanium plate on his head from an accident when he was 12 yrs. old.  In 1998 he had a shunt put in because of headaches and questionable hydrocephalus.  Needless to say for about a year he had problems with this and then they took it out permanently and ended up with a tumor in the ventricles and now it is starting to grow also caused him to have partial seizures.  

My husband went to a neurosurgeon about on an unrelated problem.  He went to see about getting a device to stop his tremors on his right side that was caused from the accident as a child.  The neurosurgeon said he would have to take the metal plate out, cut out the tumor then replace the metal plate with a plastic plate.  He also told him it would help with his headaches.

What I like to know can there be anymore brain damage and worse seizures when replacing the plate and taking out the tumor?

Thank you for any response