Ovarian cancer can preserve the uterus and the contralateral ovary under certain special circumstances: Ovarian cancer can be divided into several common types, namely epithelial, germ cell, and gonadal interstitial, etc. For epithelial ovarian cancer, only those with stage Ia, highly differentiated, non-mucinous, non-clear cell ovarian cancer can preserve the uterus and the contralateral ovary. For germ cell tumors, they are the most suitable for preserving fertility as long as they are confined to one ovary. In the case of interstitial gonadal tumors, fertility can be preserved as long as it is limited to the unilateral ovary. It is generally accepted that patients with preserved fertility should be treated more aggressively with chemotherapy after surgery if needed, and that removal of the uterus and the contralateral ovary is usually required after completion of fertility.