Gonadotroph Pituitary Adenoma Causing Treatable Infertility and Ovarian Hyperstimulation Syndrome in Female Patients: Neurosurgical, Endocrinologic, Gynecologic, and Reproductive Outcomes

Background: Gonadotroph pituitary adenoma (Gn-PA) may rarely cause ovarian hyperstimulation syndrome, leading to infertility in women, although this remains poorly described. Methods: We present a quantitative systematic review including 2 patients from our institutional and 48 from the literature with Gn-PA causing ovarian hyperstimulation syndrome to thoroughly describe the clinical features and therapeutic outcomes from multidisciplinary aspects. Results: The patients had a mean age of 31.5 years and a mean follicle-stimulating hormone level of 14.4 IU/L. Estradiol level was high in 82% of patients, at >350 pg/mL. The mean maximal adenoma diameter was 22 mm, with a Knosp grade ≥3 in 10 patients. Abdominal surgery preceded adenoma resection in 24 patients (48%). Among 25 patients for whom extent of resection was recorded, total adenoma resection was achieved in 12. Through a mean follow-up of 25 months, adenoma recurrence was observed in 5 patients, who were treated with re-resection (n = 2), radiation (n = 2), and medical therapy followed by bilateral oophorectomy (n = 1). Medical therapies were partially effective or ineffective, and adenoma shrinkage did not follow; gonadotropin-releasing hormone agonists/antagonists were partially effective in 20% of patients (2/10), dopamine agonists in 44% (8/18), and somatostatin analogues in 50% (1/2). Four experienced swelling of tumor/ovaries after gonadotropin-releasing hormone agonists/antagonists administration. Overall, chemical remission was obtained in 26 of 28 patients, normalization of ovaries in 25 of 27, and successful pregnancy in 12 of 14. Conclusions: Adenoma resection is the main treatment, leading to reduction in ovarian size and biochemical remission, with a high likelihood of subsequent spontaneous pregnancy. Increased awareness of this rare condition may help avoid unnecessary abdominal procedures.