Colitis, Microscopic

**Definition:** A condition characterized by chronic watery DIARRHEA of unknown origin, a normal COLONOSCOPY but abnormal histopathology on BIOPSY. This syndrome was first described in 1980 by Read and associates. Subtypes include COLLAGENOUS COLITIS and LYMPHOCYTIC COLITIS. Both have similar clinical symptoms and are distinguishable only by histology.

**Tree numbers:** - C06.405.205.265.173 - C06.405.469.158.188.173

**Synonyms:** - Microscopic Colitis