[Primary carcinoma of the peritoneum. Case report and literature review].

Peritoneal primary carcinoma is an unusual tumor originated on the pelvic and abdominal peritoneal surface. It is believed that it is originates from a secondary müllerian system giving place to a peritoneal primary carcinoma very similar to the epithelial ovarian cancer in its clinical presentation, histological aspect, spread patron and its treatment and prognosis. It's complex clinical presentation difficult the differentiation from an epithelial tumors from the ovary. Both tumors present ascitis, elevated CA 125 and signs of peritoneal carcinomatosis on the tomographic images. In this report is exposed the case of a 39 years old women with a pre-surgical diagnosis of primary carcinoma of the ovarian, wich was discarded during surgery founding that the primary tumor was on the peritoneal surface of the descending colon.