Hormonally active, associated with pregnancy ovarian tumors can cause some diagnostic and therapeutic problems. In the following work we present a 28-year-old primigravida in the 21st week of pregnancy who was admitted to hospital with acute abdominal pain and virilizing symptoms. Bilateral luteinized thecoma of a considerable size, secreting testosterone, was diagnosed and the woman received surgical treatment. During the operation a rupture of the left tumor was discovered. Bilateral adnexectomy was performed. After the operation the symptoms subsided. The pregnancy continued until 38 weeks gestation. A normal female fetus without virilizing symptoms was delivered by caesarean section.