“…Spontaneous OHSS (sOHSS) has the similar clinical presentations as OHSS and is a rare event. During the past 30 years, sOHSS has been reported in women with polycystic ovarian syndrome[2], hypothyroidism[3], hydatidiform mole[4], invasive mole[5], gonadotropin-producing pituitary adenoma[6,7], multiple gestation[8], disturbed liver function[9], and follicle-stimulating hormone receptor ( FSHR ) gene mutation[10-13]. Previous studies have postulated that multiple pregnancy, gestational trophoblastic diseases, hypothyroidism, gonadotropin adenoma, and FSHR gene mutations are responsible for sOHSS[10].…”