Microscopic colitis
| Microscopic colitis | |
|---|---|
| Medication | Loperamide, Bismuth subsalicylate, Budesonide |
| Frequency | 103 cases per 100,000 persons[2] |
Microscopic colitis refers to two related medical conditions which cause diarrhea: collagenous colitis and lymphocytic colitis.[2][3] Both conditions are characterized by the presence of chronic non-bloody watery diarrhea, normal appearances on colonoscopy and characteristic histopathology findings of inflammatory cells.[1]
Signs and symptoms
The main symptom is persistent non-bloody watery diarrhea, which may be profuse. People may also experience abdominal pain, fecal incontinence, and unintentional weight loss.[1] Microscopic colitis is the diagnosis in around 10% of cases investigated for chronic non-bloody diarrhea.[2]
Associated conditions
A higher incidence of
Diagnosis
Colonoscopic appearances are normal or near normal. As the changes are often patchy, an examination limited to the rectum may miss cases of microscopic colitis, and so a full colonoscopy is necessary.[2] Multiple colonic biopsies are taken in order to make the diagnosis.[1] Histological features of colonic biopsies indicating microscopic colitis are: greater than 20 intraepithelial lymphocytes per 100 epithelial cells and, additionally, 10-20 μm of a thickened subepithelial collagen band in collagenous colitis.[1] Inflammation of the lamina propria, with mainly mononuclear cells, may be observed in collagenous colitis.[1]
Pathology
Microscopic colitis is characterized by an increase in
Differential diagnosis
Differential diagnoses, which should be ruled out, include
Treatment
Lymphocytic and collagenous colitis have both been shown in randomized, placebo-controlled trials to respond well to budesonide, a glucocorticoid.[4][5] Budesonide formulated to be active in the distal colon and rectum is effective for both active disease and in the prevention of relapse.[2][6] However, relapse occurs frequently after withdrawal of therapy.[1]
Studies of a number of other agents including antidiarrheals, bismuth subsalicylate (
Anti-TNF inhibitors. split ileostomy, diverting ileostomy, and subtotal colectomy are options for management of steroid-dependent or refractory microscopic colitis.[1][9] Currently, the need to resort to surgery is limited considering the improvement of drug therapy options.[9] However, surgery is still considered for patients with severe, unresponsive microscopic colitis.[9]
Prognosis
The prognosis for lymphocytic colitis and collagenous colitis is good, and both conditions are considered to be benign.[10] The majority of people afflicted with the conditions recover from their diarrhea, and their histological abnormalities resolve,[5] although relapses commonly occur if maintenance treatment is not continued.[1][2]
Epidemiology
Incidence and prevalence of microscopic colitis nears those of ulcerative colitis and Crohn's disease.[11] Studies in North America found incidence rates of 7.1 per 100,000 person-years and 12.6 per 100,000 person-years for collagenous colitis for lymphocytic colitis, respectively.[11] Prevalence has been estimated as 103 cases per 100,000 persons.[2]
People who develop microscopic colitis are characteristically, though not exclusively, middle-aged females. The average age of diagnosis is 65 but 25% of cases are diagnosed below the age of 45.[2]
History
The condition of microscopic colitis was first described as such in 1982.[12] Lymphocytic colitis was described in 1989.[13] Collagenous colitis was recognised earlier, in 1976.[14]