Kawasaki disease resembling acute colitis.

This report presents a case of atypical Kawasaki disease (KD) in a 4-year-old boy developing with severe colitis accompanied by frequent diarrhoea and hypokalemic dehydration. Abdominal ultrasonography showed findings of left colon mucosal thickening and prominent dilatation of the colon. Antibiotic treatment was not effective. Some symptoms of KD appeared with progression of the illness. Intravenous immunoglobulin (IVIG) was administered based on a diagnosis of incomplete KD on the ninth day of the illness. The patient became afebrile soon after IVIG therapy. Diarrhoea and other symptoms dramatically subsided. The patient has recovered during the 3-month follow-up and repeated echocardiograms were normal.