Sertoli-Leydig cell tumors are rare stromal tumors of the ovary. They account for less than 0.5% of ovarian neoplasms. From a histological point of view, they show large diversity, making their clinical symptoms diverse as well. They are mostly unilateral, with average diameter 13.5 cm at the moment of diagnosis. Histologically, poorly-differentiated Sertoli-Leydig tumors pose a diagnostic problem, often being clinically asymptomatic which makes their detection relatively late, preventing efficient treatment, and resulting in worse prognosis. This article presents a rare case of bilateral poorly-differentiated Sertoli-Leydig ovarian tumor, characterized by heterologous histological structure, without hormonal unbalance, and without signs of defeminization and/or virilization, its diagnostics, and treatment.