Demons-Meigs syndrome: Rare cause of intraperitoneal and pleural effusion.

Demons-Meigs (DM) syndrome is characterized by the association of a benign ovarian tumor most often a fibroma or fibrothecoma with pleural and intraperitoneal effusions. It is a rare pathological entity. We report the case of a 40-year-old female patient with typical DM syndrome, characterized by the coexistence of pleural and intraperitoneal effusions, an ovarian mass, and a CA-125 level of 633 IU/ml. Laparotomy revealed abundant ascites and a large right ovarian mass, which was subsequently removed. Histopathological examination confirmed an ovarian fibroma. DM syndrome has a favorable prognosis, and treatment is primarily based on the removal of the ovarian tumor, without the need for chemotherapy or other therapeutic approaches.