Coeliac disease and collagenous colitis

A thirteen and a half year old girl and her father were both investigated because of chronic watery diarrhoea and growth failure or weight loss. Both were diagnosed as having coeliac disease. In the daughter, collagenous colitis was also diagnosed. The father had colonic collagen deposition with inflammatory changes as well. Both improved on gluten-free diets, but colonic collagen deposition persisted.