Serous cystadenofibromas are rare, nonmalignant tumors that develop inpostmenopausal women, with an incidence of 4.5%. Only a few cases of ovariancystadenofibroma in young patients have been reported in the literature. Althoughthis type of tumor has a rare, malignant potential, it may appear bothmacroscopically and ultrasonographically as malignant. It is well advised to beaware of the possibility of a cystadenofibroma before selecting an aggressivesurgical approach in young patients. In this paper, we report on a rare case of a 15-year-old female who was affected by a benign serous cystadenofibroma associatedwith a didelphys uterus, and who was treated with a conservative laparoscopicovarian resection. (J GYNECOL SURG 23:73)