[Rare ovarian tumor].

Ovarian steroid cell tumors represent less than 0,1% of all ovarian tumors. These tumors normally appear in adult women, producing virilization due to the secretion of testosterone. They may have occasionally a malignant behavior, but when they present during adolescence. We report the case of a 49-year-old woman with an ovarian steroid cell tumor concurrent with an ovarian fibrothecoma, which was an incidental finding, remaining the patient asymptomatic before the diagnosis. Several aspects of the symptomatology, diagnosis and treatment are discussed in this article.