My colonscopies never showed anything and they only diagnosed my Crohn's throught the capsule endoscopy. I was first told it was indeterminate/indeterminable colitis because they couldn't figure out if it was UC or Crohn's. I had symptoms of both and the promethius test said it was UC. Over time, I noticed they started writing my dx as Crohn's, but I don't know why the change...was never informed of any new information. And I have a friend who had both...had UC and had the ostomy surgeries/reversals and then developed Crohn's. So, I guess sometimes it's difficult to distinguish between the two and sometimes people end up with both. Hopefully the MRI will be more conclusive for you.