[Celiac disease and collagenous colitis. A fortuitous association].

We report the cases of two patients with coeliac disease in whom chronic diarrhoea persisted in spite of strict adherence to a gluten free-diet and regression of intestinal villous atrophy. Collagenous colitis was evidenced in both patients. Six cases of such association have already been described. Because of subepithelial deposition of collagen in the colon of collagenous colitis and in the small intestine of coeliac disease, it has been suggested that the colonic collagen band might reflect a toxic effect of gluten on colonic epithelium. However, thickening of the colonic collagen band during strict gluten free-diet, as observed in one of our cases, is not in favour of this hypothesis.