I'm not positive we are talking about the same thing, but it sounds like it. I have a "torus palantinus" which is benign bone growth - if you look it up on the internet by those words, you should find. Marti is right, about 20% of the population is affected. So, if you feel bad when you don't win at the lottery, think of this as your special gift in life
I am going to discuss this with my oral surgeon and dentist. If they can put it down as medical, I might go for it - my dental plans are maxed out at the moment. I would certainly mention your earlier encounters to the doctors, but the one may have nothing at all to do with your earlier trauma.
Good luck - I'll let you know if I find out any more. I do know that although mine is not large, it is just enough to have to use adhesive on the top. If "adhesive free" is in your hopes, it might be worth pursuing.