Gastroenterology Book

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Microscopic Colitis

Aka: Microscopic Colitis, Lymphocytic Colitis, Collagenous Colitis
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  1. See Also
    1. Chronic Diarrhea
  2. Epidemiology
    1. More common in older patients (age 50 years old and older)
    2. Causes 10% of Chronic Diarrhea cases
  3. Risk Factors: Medications
    1. NSAID use for longer than 6 months
    2. Aspirin
    3. Statins
    4. Proton Pump Inhibitors
    5. Selective Serotonin Reuptake Inhibitors (SSRI)
  4. Symptoms
    1. Typical presentation is nocturnal Diarrhea in older patient, and not better with fasting
  5. Signs
    1. Secretory Diarrhea
  6. Labs
    1. Stool studies without microscopic blood or mucus
  7. Associated Conditions
    1. Celiac Sprue (5% of cases)
  8. Diagnosis: Colonoscopy findings
    1. Normal gross appearance
    2. Biopsy of transverse colon confirms diagnosis with one of two histologic patterns
      1. Lymphocytic Colitis
        1. Lamina propria with lymphocytic infiltrate
      2. Collagenous Colitis
        1. Subepithelial collagen layer increased >10mm
  9. References
    1. Abdo (2003) Can Fam Physician 49:1473-8
    2. Levison (1993) Gastroenterology 105(5): 1594-6

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