Abstract Disclosure: S. Mark: None. M.H. Shanik: None. I.J. Romao: None. Ovarian stromal hyperplasia (OSH) is a rare cause of hyperandrogenism. It is a non-neoplastic proliferation of ovarian stromal cells that leads to the overproduction of testosterone. This case report highlights that OSH should be considered in patients who present with hyperandrogenism.A 49-year-old postmenopausal woman with a past medical history of polycystic ovary syndrome, type 2 diabetes and obesity complained of unwanted hair growth. On the physical exam her BMI was 51. She had an obese body habitus, hirsutism of her chin, chest and back and acanthosis nigricans on her neck. Blood work showed a total testosterone of 203 (2-45 ng/dL) and free testosterone 29 (0.1-6.pg/dL). FSH, LH, DHEAS, estradiol, SHBG and 17 hydroxyprogesterone (17 OHP) were in the normal range. She completed a 1 mg dexamethasone suppression test that was normal. She took spironolactone for hirsutism with minimal relief. Pelvic ultrasound was limited due to body habitus. CT of the abdomen and pelvis showed no adrenal or ovarian masses. The patient had a family history of pancreatic, ovarian, and breast cancer. Given her symptoms and her family history, the patient underwent genetic testing that was negative. She underwent bilateral salpingo-oophorectomy. Pathology revealed bilateral ovarian stromal hyperplasia. After surgery, her total testosterone normalized to 18 ng/dL and free testosterone was 1.6ng/dL with improvement in hair distribution. The patient continued to struggle with her weight and diabetes management.OSH is a non-malignant proliferation of ovarian stromal cells which leads to overproduction of testosterone. It occurs more in postmenopausal women and rarely in women of reproductive age. There is approximately 1 case of OSH in every 1000 cases of hirsutism. Clinical features include obesity, insulin resistance, acanthosis nigricans, acne, and hirsutism. Testosterone levels are usually greater than 150 ng/dL. Differential diagnosis includes PCOS, Cushing’s disease, adrenal or ovarian tumor and non-classic adrenal hyperplasia. Transvaginal ultrasound can be used to assess the ovaries for tumors or increase in size. If negative a pelvic MRI or CT can be done for further assessment. The gold standard for diagnosis would be histological evaluation following bilateral oophorectomy which is curative. Pathology usually shows stromal hyperplasia that is nodular or diffuse. Alternative treatment options include GNRH agonist therapy in patients who are not surgical candidates. Complications of this condition include insulin resistance, acanthosis nigricans and diabetes mellitus. After treatment hyperandrogenism skin changes improve. It is important that clinicians consider OSH as a cause of hyperandrogenism to ensure timely diagnosis and treatment. Presentation: 6/2/2024
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