Can i ask how they eventually found it? Did they not do an MRI until the last minute? Or was an MRI ordered and nothing noticed?
What do you attribute them finding it to? I always love to hear stories of inept doctors and what they failed to do, that results in someone finding out they have a tumor 10 years after the fact.
My guess is they refused to run an MRI on your brain and instead ran a CBC or some other useless tests, then sent you home healthy. When they finally agreed to run the MRI in your 60's they found the growth?