SAT367 A Rare Case of Ovarian Cellular Fibroma Producing Testosterone

Disclosure: H.K. Rai: None. P. Dandona: None. Background: Ovarian fibromas are hormonally inactive, benign sex cord-stromal tumors. However, the occurrence of ovarian fibromas in a woman presenting with post-menopausal bleeding, hirsutism, and elevated testosterone levels raises suspicion of such tumors being functionally active.Case: 62-year-old menopausal woman presented for evaluation of worsening facial hair for the past year. She reported vaginal spotting for the past two months and was following up with a gynecologist. She denied acne, male pattern baldness, or any other virilizing features. She was also recently diagnosed with polycythemia; hematological workup was remarkable for elevated testosterone. Her blood work was significant for elevated testosterone levels and hemoglobin, results as follows: total testosterone: 160ng/dl (2-45 ng/dL), free testosterone: 25.4pg/ml (0.1-6.4 pg/ml), sex hormone binding globulin (SHBG): 26 nmol/L (14-73 nmol/L), estradiol: <15 pg/ml (post-menopausal range: </=31 pg/ml), FSH: 17.3mIU/ml (23.0-116.3mIU/ml), LH: 19.1mIU/L (10.0-54.7 mIU/mL), prolactin: 5.7 ng/mL (2.0-20.0 ng/mL), DHEAS: 78 mcg/dL (12-133 mcg/dL), 8 AM cortisol: 17 mcg/dL (10-20 mcg/dL), ACTH: 11pg/ml (6-50pg/ml), Hb: 16.6g/dl (11.7-15.5 g/dL) and hematocrit: 49.8% (35.0-45.0%). Ultrasound pelvis showed heterogeneous thickened endometrium, small left-sided intramural leiomyoma of the uterus and ovaries were not well identified. MRI pelvis with and without contrast showed a 2.4 cm left uterine fibroid. A simple cyst was noted in the right ovary and two para-ovarian cysts were noted on the left ovary. The overall appearance of both ovaries was similar to a CT scan done a year earlier. She underwent a total hysterectomy with bilateral salpingo-oophorectomy. Surgical pathology was remarkable for cellular fibroma of both ovaries. After surgery, the patient's facial hair significantly improved, and she was noted to have normal testosterone levels (total testosterone: 23, free testosterone: 2.6, SHBG: 50). Her hemoglobin normalized as well, reaching a value of 13 g/dL. Conclusion: Our patient presented with post-menopausal bleeding, hirsutism, polycythemia, and increased testosterone levels. After she underwent total hysterectomy with bilateral salpingo-oopherectomy, her symptoms resolved. Testosterone and hemoglobulin levels returned to normal. Surprisingly, ovarian cellular fibroma on both sides was identified by surgical pathology. Ovarian cellular fibromas are rarely linked to endocrine activity, but with this case, we want to emphasize that its hormonal activity needs further exploration in the future. Presentation Date: Saturday, June 17, 2023