A case of multicystic peritoneal mesothelioma

Abstract

We describe a rare case of multicystic peritoneal mesothelioma. A 20-year-old female presented with a multicystic mass, measuring 12×9×5cm, in the pelvic cavity. The radiological differential diagnosis included lymphangioma, dissemination of malignant tumor, and unusual type of peritoneal mesothelioma. The levels of CA 19-9 and CA 125 were elevated. Cytological examination of the fluid from the ruptured tumor in the Douglas pouch showed clusters of benign mesothelial cells. Histological examination of the resected mass revealed it was benign cystic mesothelioma. The lining cells were positive for Alcian blue, and decolorized with hyaluronidase treatment. Immunohistochemically, the lining cells were positive for cytokeratin.