Collagenous colitis is a rarely recognized disease characterized clinically by watery
diarrhoea, and morphologically by a broad bandlike deposition of increased amounts
of collagen under the basement membrane of the surface epithelium. Pathogenetically,
a disturbance of the colonic pericryptal fibroblastic sheath is most probably involved.
Collagenous colitis - Diarrhoea - Pericryptal fibroblast sheath
