A 72-year-old Caucasian man presented with subtle and insidious symptoms of pain in the left iliac fossa and vomiting. The first clinical impression was of diverticulitis but he did not improve with conservative management. An initial contrast tomography (CT) scan demonstrated no diagnostic features. Four days later, a repeat CT scan demonstrated intramural gas in the ascending colon and in the intrahepatic portal venous radicles. There was a thrombus in the superior mesenteric artery with infarction of the caecum and ascending colon. An urgent right hemicolectomy was carried out. Although there was resolution of the thrombus and air in the portal system, the patient died 8 days later from intestinal haemorrhage.
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