A primary mucinous cystoadenocarcinoma of the retroperitoneum.

A case of primary retroperitoneal mucinous cystoadenocarcinoma of the ovarian type in the presence of normal ovaries is reported. The histogenesis of this rare tumor has been uncertain. Special immunohistochemical stains done on our specimen show that the histogenesis of this tumor is most likely from mucinous metaplasia of coelomic mesothelium. Three cases of primary retroperitoneal mucinous cystoadenocarcinoma of the ovarian type have previously been reported in the English literature and are reviewed.