Collagenous colitis
Collagenous is an condition of the . Together with the related condition colitis, it is a subtype of microscopic colitis, which is characterized by that specifically affects the colon, and a presentation that involves watery but a lack of rectal bleeding. Microscopic colitis does not usually cause macroscopic changes to the colon that allow a visual during , instead causing microscopic changes that can be detected through histopathological examination of colonic biopsies. The nature of these microscopic changes is what differentiates collagenous from lymphocytic colitis, with the characteristic finding in collagenous colitis being depositions of in the between the colonic . Collagenous colitis, and microscopic colitis as a whole, is sometimes considered to be an inflammatory bowel disease (IBD) along with disease and colitis. However, little is known about the of microscopic colitis, and so the degree of similarity to the inflammatory bowel diseases is uncertain.
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