[Large mesenteric cyst in a patient suspected of ovarian cyst].

Mesenteric cystic tumors are very rare. They may simulate the ovarian cysts. We report a case of a 38 year-old woman with large cystic tumor suggesting ovarian cyst. The patient was operated on and we found that genital organs were normal. Besides there was a large cyst of small intestine mesentery with 10 liters of clear fluid. The cyst was removed. Histological material showed mucinous cystadenoma.