A 73 year-old man was admitted to our hospital with complaints of sudden onset of abdominal pain, nausea and vomiting. The pain was localized mainly in the upper left abdomen with clinical signs of peritonitis. During the time in the emergency department, the abdominal pain markedly worsened. On examination by the attending emergency physician, he responded adequately and was fully oriented. Blood pressure was 120/70 mm Hg, pulse was 110 beats per minute, body temperature was 36.9°C, respiratory rate was 18, and oxygen saturation was 97% with 4 liter oxygen via nasal cannula. The abdomen was rigid, with distension mainly in the upper left abdomen. Normal saline and morphine sulfate were administered intravenously. Blood levels of gamma-gt (102 U/l), lactatdehydrogenase (367 U/l), bilirubin (2.2 mg/dl), direct bilirubin (0.59 mg/dl), serum glucose (259 mg/dl), lactate (2.9 mmol/l) and leukocytes (32.000) were markedly elevated. The patient's medical history revealed coronary heart disease, insulin-dependent diabetes mellitus, hypertension, Barrett oesophagus, hiatus hernia, a post appendectomy status and a history of stroke. He had a smoking history of 20 pack-years, and occasional consumption of alcohol. The use of illicit drugs was denied, and he didn´t remember unusual ingestions.A plain radiograph of the abdomen showed no evidence of free abdominal air, air-fluid levels or dilated intestinal loops.Abdominal ultrasonography revealed thickened walls of small bowel loops with cockade signs and moderate ascites.By reason of a lack of clear diagnosis and severe abdominal pain despite intravenously administered morphine, a CT-angiography of the abdomen was resolved.The scans revealed thickened walls of the small bowel over a distance of approximately 16 cm, extending from the distal second part of the duodenum to the proximal jejunum. There were moderate amounts of perihepatic and perisplenic fluid. No free intraperitoneal air was found. The mesenteric vasculature was unremarkable. Multiple fluid filled diverticula measuring up to 3 cm in the longest diameter were found alongside the jejunal walls. Additionally there was surrounding fat stranding from the distal second part of the duodenum to the proximal jejunum [Table/ Fig-1,2].The findings were indicative of an exacerbation of chronic jejunal diverticulitis with acute diverticulitis of the proximal jejunum, Radiology section ascending to the duodenum. Conservative antibiotic therapy was initiated but due to increasing pain in the night, an exploratory laparotomy was carried out on the next morning. Upon exploration 3 inflamed jejunal diverticula were detected in the area of the ligament of Treitz accompanied by moderate amounts of brownish non-foul smelling fluid and paralytic jejunal loops. The walls from the distal second part of the duodenum to the proximal jejunum appeared congested and inflamed. However, there were no signs of bowel ischemia, covered or open perforation. Four abdominal drains were inserted intraoperatively. The patient's postoperative cours...