THU643 Hyperandrogenism Caused By A Steroid Cell Tumor Of The Ovary In A Postmenopausal Woman

Disclosure: M.S. Myint: None. A. Pinero-Pilona: None. Introduction Steroid cell tumor-not otherwise specified (SCT-NOS) is a subtype of steroid cell tumors which, in turn, is a subtype of sex cord-stroma tumors of the ovary. SCTs are exceedingly rare, account for less than 0.1% of all ovarian tumors, can secrete androstenedione, α-hydroxyprogesterone, and testosterone, and cause hyperandrogenism. We present a case of SCT-NOS, which was revealed postoperatively and was associated with breast cancer. Clinical Case A 74-year-old postmenopausal woman presented approximately a year after the onset of hirsutism, frontal alopecia and an elevated serum total testosterone (TTST) 341 ng/dl (reference range 3 to 41 ng/dL) and free testosterone (FRTST) 10.5 pg/mL (reference range 0.0 to 4.2 pg/mL). She has no clitoromegaly, acne, striae, or changes in voice and no history of infertility or PCOS. Physical examination was significant for cushingoid appearance, frontal alopecia, and hirsutism on the face. Her estradiol level was 213 pg/mL (reference range 0 to 30 pg/mL), FSH and LH levels were in the postmenopausal range, 17-hydroxyprogesterone, DHEA-sulfate, androstenedione, and morning cortisol were normal. Pelvic ultrasonography and CT of the abdomen and pelvis did not reveal an adrenal or ovarian abnormality. We suspected an ovarian source and thus recommended bilateral oophorectomy due to the markedly elevated testosterone level and postmenopausal status. We also started spironolactone. Before setting up for surgery, she was diagnosed with invasive lobular left breast cancer and underwent surgery and radiotherapy. Then, she had bilateral salpingo-oophorectomy. After surgery, TTST dropped to 4 ng/dL and FRTST to 2 pg/mL. Her hyperandrogenic symptoms significantly subsided. Pathology revealed a 1.5 cm red-brown nodule within the left ovary. The nodule contains polygonal cells with vacuolated cytoplasm arranged in nests, cords, and sheets. Cells were positive in calretinin and inhibin and negative in Reinke crystal. A steroid cell tumor, NOS was confirmed. Pathologic features associated with aggressive clinical behavior were not present. Conclusion The incidence of SCT-NOS is highest in women of childbearing age but rare in postmenopausal women. There were only a few case reports of SCT-NOS, most of which are relatively larger and revealed on imaging. In our case, the imaging did not localize the tumor. Sex cord-stromal tumors are often not visualized on imaging. Failure to identify a tumor on imaging does not rule out the presence of a tumor. One should always rule out androgen-secreting tumors in cases of significantly high testosterone. When imaging fails to reveal a tumor, bilateral oophorectomy should be considered in postmenopausal women and an ovarian and adrenal venous sampling in women of childbearing age. It is worth doing so because hyperandrogenism is associated with an increased risk of endometrial and breast cancer. Presentation: Thursday, June 15, 2023