Collagenous colitis is a type of microscopic colitis. Colonoscopy is normal or almost normal. The condition presents with watery diarrhoea and there may be abdominal pain.
0:00 Intro
0:10 Symptoms and age and sex predominance
0:48 Conditions associated with collagenous colitis
1:20 Histological features of collagenous colitis
2:15 Trichrome stain of collagenous colitis highlighting thickened collagen layer
2:44 Biopsy showing collagenous colitis with loss of surface mucosa
3:13 High power image of collagenous colitis showing thickened collagen band and lymphocytes, plasma cells and eosinophil polymorphs in lamina propria.
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