Community-acquired Clostridium difficile-associated diarrhoea in a patient with colonic carcinoma.

In the vast majority of cases, Clostridium difficile-associated diarrhoea and pseudomembranous colitis develop following the use of antibiotics. We report a case in which C. difficile-associated diarrhoea was diagnosed in the absence of previously reported predisposing factors. It transpired that the patient had a colonic carcinoma. We suggest that a diagnosis of C. difficile-associated diarrhoea in the absence of a history of antibiotics or other established causes should prompt a colonoscopy to search for alternative explanations for the alteration in bowel flora which such an infection indicates.