|Microscopic colitis is a chronic condition. It causes inflammation of the colon. These conditions are referred to as microscopic, because unlike other inflammatory bowel diseases, there is no sign of inflammation of the lining of the intestine when viewed during a colonoscopy procedure. Microscopic colitis can only be diagnosed by biopsies of the colon which demonstrate inflammation on the microscope. The cause of microscopic colitis is not known till date.
Review articles are the summary of current state of understanding on a particular research topic. They analyze or discuss research previously published by scientist and academicians rather than reporting novel research results.
Review article comes in the form of systematic reviews and literature reviews and are a form of secondary literature. Systematic reviews determine an objective list of criteria, and find all previously published original research papers that meet the criteria. They then compare the results presented in these papers. Literature reviews, by contrast, provide a summary of what the authors believe are the best and most relevant prior publications.
The concept of "review article" is separate from the concept of peer-reviewed literature. It is possible for a review to be peer-reviewed, and it is possible for a review to be non-peer-reviewed.