Free colonic perforation in a patient with Crohn's disease and loop ileostomy: report of a case.

Free bowel perforation in Crohn's disease is a relatively rare complication. In this report, we present a case of free colonic perforation in a Crohn's disease patient with loop ileostomy previously constructed for intractable perianal abscess. Normally, fecal diversion by ileostomy results in an improvement in Crohn's colitis. However, in some cases, fecal diversion is reported to adversely affect the inflammation of the diverted bowel, and it is this unusual complication of Crohn's disease that we discuss here.