INTRODUCTION Primary peritoneal serous carcinoma is a rare, malignant, epithelial tumor arising from the peritoneum and associated tissues, that presents commonly with diffuse peritoneal involvement and ascites. Carsinomas that morphologically resemble papillary serous carcinoma of the ovary, with uninvolved and minimally involved ovaries, with lesion of the peritoneum larger than other primary ovarian lesions, and with no other identifiable primary tumor, are categorized under such. The aim of this report is to contribute to the fund of knowledge pertinent to this rare lesion with a relatively poor prognosis.