Abstract
We report a case of retroperitoneal cystic mesothelioma. The patient was a 42-year-old woman with no particular problems in her medical history. She first presented to another hospital becouse of common cold, where an abnormal mass in her lower abdomen was pointed out. Then she was admitted to the hospital. The findings obtained by Computed tomography, ultrasonography and barium enema showed a large cystic tumor probably originated from the retroperitoneum. Laparotomy was performed. Surgical exploration showed that a solitary cystic mass was located behind the descending colon and compressed the colon imward. The postoperative histological findings revealed that the tumor was cystic mesothelioma. This histological classification can be achieved by histochemical and immunohistochemical studies with keratin, colloid-Fc and CEA. Retroperitoneal cystic mesothelioma is not a common disease, however, it should be taken into consideration in the differential diagnosis of abdominal masses.
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