I have Collagenous Colitis( Microscopic Colitis). Everywhere, I read that this always shows a normal colonoscopy without inflammation visible, and no blood in stool. This information is not correct. I first went to the doctor years ago because of blood in the toilet bowl. My colonoscopy did show inflammation in the colon. But it was still Collagenous Colitis ( often called Microscopic Colitis) diagnosed by biopsy. This information out there needs correction.