A rare case of acute abdomen.

Mesenteric cysts are tumoural formations which are generally benign in character, originate from the intestinal mesentery, and rarely cause abdominal tumours. They are asymptomatic unless a complication occurs, and thus may be incidentally diagnosed. Symptomatic cases may show up with findings such as abdominal pain, abdominal mass, nausea, and vomiting, and sometimes patients present with an acute abdomen. Treatment includes total excision of the cyst. We present the case of a male patient admitted to our emergency department with acute abdominal symptoms, who was subsequently found to have a mesenteric cyst measuring 30×20×9 cm.