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|Treatment||Collagenous Colitis and Lymphocytic Colitis|
Inflammatory bowel disease is the general name for diseases that cause inflammation in the intestines, most often referring to Crohn’s disease and ulcerative colitis. Collagenous colitis and lymphocytic colitis are two other types of bowel inflammation that affect the colon. The colon is a tube-shaped organ that runs from the first part of the large bowel to the rectum. Solid waste, or stool, moves through the colon to be eliminated. Collagenous colitis and lymphocytic colitis are not related to Crohn's disease or ulcerative colitis, which are more severe forms of inflammatory bowel disease.
Collagenous colitis and lymphocytic colitis are also called microscopic colitis. Microscopic colitis means there is no sign of inflammation on the surface of the colon when viewed with a colonoscopy or flexible sigmoidoscopy two tests that let a doctor look inside your large intestine. Because the inflammation isn’t visible, a biopsy is necessary to make a diagnosis. A doctor performs a biopsy by removing a small piece of tissue from the lining of the intestine during a colonoscopy or flexible sigmoidoscopy.
Collagenous colitis is most often diagnosed in people between 60 and 80 years of age. However, some cases have been reported in adults younger than 45 years and in children. Collagenous colitis is diagnosed more often in women than men.
People with lymphocytic colitis are also generally diagnosed between 60 and 80 years of age. Both men and women are equally affected.
The symptoms of collagenous colitis and lymphocytic colitis are the same—chronic, watery, non-bloody diarrhea. Abdominal pain or cramps may also be present. People with collagenous colitis and lymphocytic colitis may suffer from ongoing diarrhea while others have times when they are symptom free.
Some scientists think that collagenous colitis and lymphocytic colitis are the same disease in different stages. The only way to determine which form of colitis a person has is by performing a biopsy.
A diagnosis of collagenous colitis or lymphocytic colitis is made after tissue samples taken during a colonoscopy or flexible sigmoidoscopy are examined with a microscope.
Collagenous colitis is characterized by a larger-than-normal band of protein called collagen inside the lining of the colon. The thickness of the band varies; so several tissue samples from different areas of the colon may need to be examined.
With lymphocytic colitis, tissue samples show an increase of white blood cells, known as lymphocytes, between the cells that line the colon. The collagen is not affected.
Scientists are not sure what causes collagenous colitis or lymphocytic colitis. Bacteria and their toxins, or a virus, may be responsible for causing inflammation and damage to the colon. Some scientists think that collagenous colitis and lymphocytic colitis may result from an autoimmune response, which means that the body's immune system destroys healthy cells for no known reason.