Acute abdomen caused by a ruptured spontaneously infected mesenteric cyst.

Mesenteric cysts are uncommon and usually asymptomatic abdominal tumors. Spontaneous infection is a very rare complication of these lesions. This report presents a case of spontaneously infected and perforated mesenteric cyst. Any incidental mesenteric cyst diagnosed during radiological examination should be removed completely, even if it has been asymptomatic, to prevent potential life-threatening complications.