Key Words: Malignant mixed müllerian tumor, ovarium.

These tumors are seen more frequently at 5th and 7th decade (1,2). They are usually asemptomatical (1), 10 percentages of them are bilateral and are frequently seen at nulliparous women. More than 80 percents of patients have an extraovarian abdominal spread (2). Ovarian malignant mixed müllerian tumors have two types;the low degree (müllerian adenosarcoma) and high degree (carcinosarcomas, mixed mesodermal tumors) (2). Müllerian adenonosarcomas are usually unilateral, limited in the over and their diameters are approximately 10 cm (2). The predominance of malignant epithelial cells in malignant mixed müllerian tumors may cause an erroneous diagnosis of carcinoma. Special stains and electron microscopy may contribute to the differantial diagnosis (3). This report describes a-31-year-old, nulliparous woman with malignant mixed müllerian tumor. She has referred to the Obstetric and Gynecology Department of the Trakya University Hospital for the evaluation of abdominal swelling and pain for two months. Gynecologic examination showed 10x8 cm diameter mass at the left adnexial region. The uterus had a normal size. There was a view that suggested to originate from the left ovary; including solid and cystic components; at 13x11x9 cm diameter in ultrasonography. There was also ascites in the abdomen. Laboratory findings revealed elevated CA 125 and ESR was 65 mm / hour. The mass that was obtained during laparotomic explaration, was at 8x10 cm diameter, papillamatous and solid. Total abdominal hysterectomy and bilateral salpingooopherectomy and appendectomy was performed. Approximately 300 cc ascites was aspirated and the abdominal aspiration fluid specimen was taken.Pathologic diagnosis was confirmed malignant mixed müllerian tumor of the left ovary. These tumors are usually seen among the postmenopausal, nulliparous women (2); but our case was unusually a-31-year-old and multipara woman. We haven’t met any case at this age in the literature. No any other case described in the literature until 63 years old malignant mixed müllerian tumor that including carcinomatous and sarcomatous elements reported from