Background
Small bowel diverticulitis is a rare hereditary disease, and usually seen on the antimesenteric side. In this study, our aim is to present a case of mesenteric jejunal diverticulitis which was confused with acute appendicitis.

Material and Methods
A 35 year old male patient was admitted to our clinic with abdominal pain, nausea and loss of appetite. On physical examination, we detected hypoactive bowel sounds, abdominal tenderness, and defense on the right side of the abdomen. In laboratory findings, locosytosis was detected: other parameters were normal.

Result
Direct abdominal X-ray graphy showed a few bowel air-fluid levels. Ultrasonography (USG) examination revealed minimal fluid between intestinal loops. The findings indicated that the patient had acute appendicitis and a laparoscopic exploration was performed. In this exploration, we observed the appendix was normal, but spinning purulent contents of the intestine were discovered. Because of the mesenteric location, the jejunal diverticulitis could not initially be determined which necessitated a laparotmy. A diveritculitis measuring 3x1cm had settled on the mesenteric side of the jejunum. The area around the diverticulitis was inflamed. As there was no perforation, resection was not considered. The patient was discharged on the post-operative fourth day with antibiotic therapy.

Conclusion
Jejunal diverticulitis is rare and may be difficult to diagnose. In uncomplicated cases, medical treatment should be applied for jejunal diverticulitis. Mesenteric jejunal diverticulitis can be confused with other disorders causing acute abdominal pain and may result in unnecessary laparotomies. We should consider jejunal diverticulitis in patients who present with acute abdomen pains.