Omental cysts are rare and difficult to diagnose preoperatively. They are most
frequently discovered in children or as an incidental finding during laparotomy for
another condition. The omental cyst is usually asymptomatic; abdominal distention,
vague abdominal pain, and vomiting are the usual clinical symptoms, and there may
be a palpable mass. Complete surgical excision is the treatment of choice and
prognosis is excellent if the resection is complete. We present a case of an omental
cyst arising from the stomach in a 24-year-old male who presented with right lower
quadrant abdominal pain and fever. A laparoscopic appendectomy was performed
under the impression of acute appendicitis. During the operation, an infected
omental cyst arising from the stomach was noted. We converted the laparoscopic
procedure to laparotomy and the cyst was resected completely. The patient had an
uneventful postoperative course and was discharged on the 7th postoperative day.