Colonic dilatation has been reported as an occasional complication of infectious colitis in single case reports and short series, but no large series has been published. We analysed 19 cases of self-limited colitis complicated by colonic dilatation, with infective agents identified in 14, admitted to a Regional Infectious Diseases Unit. Colonic dilatation, defined as a minimum transverse colonic diameter of 7 cm on plain abdominal X-ray, was associated with approximately 1of cases of notifiable diarrhoea requiring hospital admission. The clinical course was associated with pyrexia (in 90), tachycardia (in 90), hypoalbuminaemia (in 100), anaemia (in 84) and reactive thrombocytosis (in 63). There was a history of antidiarrhoea1 agents or opiate analgesia in eighteen patients (95). Intensive medical management, consisting of intravenous antibiotics, steroids, supplementary nutrition and withdrawal of antimotility agents, resulted in resolution in 17 patients. Two patients required subtotal colectomy for perforation of the transverse colon, but neither developed severe peritonitis, and both subsequently underwent reversal of ileostomy. With early recognition and close observation of colonic dilatation in patients with acute diarrhoea, most cases can be successfully managed conservatively with preservation of the colon. Surgical intervention should be considered in patients with progressive colonic dilatation despite intensive medical management. There were no clinically useful parameters distinguishing self-limited colitis from inflammatory bowel disease acutely, so initial management should cover both possibilities.
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