Benign cystic mesothelioma in the pelvic peritoneum

—A case report—

Abstract

Background : Benign multicystic mesothelioma (BMM) is a rare mesothelial proliferative lesion characterized by multilocular cysts in the pelvis and abdominal cavity. Approximately 130 cases of BMM have been documented in the literatures, but reports of the cytopathological features are few. We report herein on a case of BMM in the pelvic peritoneum.
Case : A-30-year old woman with the chief complaint of pain in the lower left quadrant was referred to our hospital. Transvaginal ultrasonography, CT and MRI detected a mass with a multilocular cystic tumor in the pelvis. Cytologically, sheets of monomorphous mesothelial cells and papillary or ball-like clusters of mesothelial cells were observed in the intracystic fluid smear. The patient subsequently underwent an excision of the tumor. The pathological and cytopathological examination of the tumor revealed BMM in the pelvic peritoneum.
Conclusion : Cytology of the touch preparation and the intracystic fluid smear provided useful information for a pathological diagnosis in our case.