Benign cystic mesothelioma of peritoneum: a case report

A case of multicystic peritoneal mesothelioma involving the pelvic serosal surface is reported. Morphological and immunohistochemical findings agree with the suggested mesothelial origin of this lesion. Lymphangioma was excluded by the unreactivity to Factor VIII related antigen, ULEX-E1 and CD31. Recurrence after a few months from the first surgical resection disagrees with the reactive hyperplastic nature proposed; a tendency to recur was independent from the absence of an aggressive growth pattern and cytologic atypia.