Premature ovarian failure (POF), premature ovarian insufficiency, premature menopause or hypergonadotropic hypogonadism, a serious life-changing condition that affects young women, remains an enigma and the researcher's challenge. In the present article we described a case of singleton pregnancy in a 33-year-old patient, presenting with POF and treated with hormone replacement therapy. Twenty months later this therapy led to maturation of one follicle, recruitment and fertilisation of the residual oocyte and spontaneous pregnancy ensued. A normal infant was delivered by cesarean section.