Collagenous Colitis
07.23.09
Collagenous colitis is an inflammatory colonic disease with peak incidence in the 5th decade of life, affecting women more than men. Its clinical presentation involves watery diarrhea, usually in the absence of rectal bleeding. It is often classified under the umbrella entity microscopic colitis, along with a related condition, lymphocytic colitis.
On colonoscopy, the mucosa of the colon typically looks normal, but biopsies of affected tissue usually show deposition of collagen in the lamina propria, which is the area of connective tissue between colonic glands. Radiological tests, such as a barium enema are typically normal.
Treatment of collagenous colitis is often challenging, and many agents have been used therapeutically:
• Bismuth agents, including Pepto-Bismol
• 5-aminosalicylic acid
• Budesonide
• Immunosuppressants, including azathioprine
• Corticosteroids
An association between collagenous colitis and celiac disease has been reported, but there is no evidence that dietary restrictions used in celiac disease management are of benefit in collagenous colitis therapy.There have also been reports of an association between collagenous colitis and lymphoma.
Collagenous colitis (CC) is a recently described clinico-pathologic entity characterized by intractable chronic watery diarrhea, crampy abdominal pain, normal or near normal colonoscopic examination and histologically by a thickened subepithelial collagenous band associated with chronic inflammatory reaction and increased intraepithelial lymphocytic infiltrate in the colonic biopsies. Its pathogenesis remains nclear. We report a rare case of collagenous colitis in which immunohistochemical studies revealed marked deviations from normal in the endocrine elements of the colonic bowel.
To our knowledge this is the first report of such a study in collagenous colitis. Collagenous colitis is inflammation of the colon, the last portion of the digestive tract that ends at the rectum and anus. The most common symptom is chronic watery, non-bloody diarrhoea. In severe cases, the patient may be going to the toilet up to 20 times a day.
Collagenous colitis is a rare condition that affects about four people in every 10,000. It tends to develop in people aged over 40 years. Women outnumber men 20 to one, for reasons that are not clear.
There is no cure but lifestyle changes and medical treatment can manage the symptoms in most cases. Collagenous colitis is sometimes called microscopic colitis. Collagenous colitis seems to occasionally run in families, which suggests a genetic component to the condition.
However, doctors aren’t sure what causes the inflammation. One theory proposes that an unknown virus or bacterium is to blame. Another theory is that collagenous colitis is a type of autoimmune disorder, which means the immune system attacks a healthy part of the body by mistake. Some people with collagenous colitis also have other autoimmune disorders such as rheumatoid arthritis, scleroderma or Sjogren’s syndrome.
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