Primary peritoneal cancer is a rare tumor, which may be mesothelial or mullerian in nature. It can develop from unifocal or multifocal origin and the clinical and histologic disease entities are similar to those of primary papillary serous carcinoma of the ovary, but the main features of primary peritoneal cancer are widely disseminated malignancy along the peritoneal surfaces, the omentum, and abdominal viecera, with minimal or no ovarian involvement. Recently investigators have analyzed the morphology of these tumors and have used histochemical, eletron microscopic and immunohistologic techniques in an attempt to identify, characterize, and categorize. We have experienced a case of a primary peritoneal cancer which developed in the patient who had probably a previous total hysterectomy and both salpingooophorectomy.