[Clostridium difficile and ulcerative colitis].

Different diagnostic considerations take place when a diarrhea of recent development and prolonged or atypical course is evaluated. Infectious colitis, including Clostridium difficile colitis, and inflammatory bowel disease are the main diagnosis that we put into consideration. We present a 42-year-old woman that begins with diarrhea of probable infectious cause. Because of the recurrence of the symptoms we arrived to the diagnosis of Clostridium difficile colitis complicating an ulcerative colitis. Clostridium difficile colitis has particular characteristic in the context of an inflammatory bowel disease. We should know them because appropriate treatment improves the prognosis.