Thanks for the reply. You're making a very valid point!
First : Sorry to ear what happened to your mother.
Doctors telling what we want to ear is also a problem! Mostly, I believe, because when something like a brain tumor is threatening your life, you might not want (and know) what is best for yourself. Doctors can be influenced by their patients.
As you stated, the second opinion can be wrong and it is very hard for the patient to know who to believe. I wish everybody could have a little help from a friend with some photoshop & 3d printing skills!