This article reports the live birth of a healthy newborn using vitrified–warmed oocytes in a young patient with invasive mucinous ovarian carcinoma (stage Ic). Diagnosis was performed after a laparoscopic left adnexectomy. She underwent two cycles of ovarian stimulation, and 14 oocytes were vitrified before fertility-sparing surgery with uterus preservation went ahead. One year later, a transfer of two embryos was performed after insemination of warmed oocytes. Eighteen days after the transfer, she underwent a laparotomy because of abdominal pain, vaginal bleeding and haemoperitoneum.