Mucinous Cystadenocarcinoma of the Retroperitoneum: Report of a Case

Abstract

Retroperitoneal mucinous cystadenocarcinomas are extremely rare. A 40-year-old Japanese woman was found to have a retroperitoneal mucinous cystadenocarcinoma of ovarian type. Both ovaries were normal. Concentrations of carcinoembryonic antigen and carbohydrate antigen 19-9 in the cyst fluid were extremely high (810 000 ng/ml and 8 082 000 IU/l, respectively). The tumor varied from benign to borderline and malignant in microscopic appearance, and the lesion was composed of mesothelium-like cells. The histologic and immunohistochemical findings suggested that the tumor developed from mucinous metaplasia of the coelomic mesothelium.