Abstract
Cytomegaloviral enterocolitis is an uncommon infection that can complicate inflammatory bowel disease. A case of a patient with a three-year history of Crohn's disease is reported. He had been in a stable condition on mesalamine 4 g/day and methylprednisolone 10 mg/day for three years until four weeks before admission. The patient was admitted with complaints of fever, abdominal pain and watery diarrhea. A diagnosis of an exacerbation of Crohn's disease was established. The radiological examination revealed narrowing of the terminal ileum. Multiple fistulas and abscess-like images were observed. The patient then underwent ileocolic resection and ileostomy. The histopathological examination revealed Crohn's ileocolitis with superimposed cytomegalovirus infection. In patients with rapidly deteriorating inflammatory bowel disease, cytomegalovirus infection should be kept in mind as one of the differential diagnoses.