Published online by Cambridge University Press: 24 November 2021
Non-epithelial ovarian cancers account for approximately 10% of all ovarian cancers. Malignant ovarian germ cell tumours and the sex cord–stromal tumours are the common ones. The malignant ovarian germ cell tumours are typically early-life tumours and in their management fertility preservation techniques are usually used. The sex cord–stromal tumours are indolent neoplasias and are associated with hormone-dependent syndromes, with endocrine manifestations. Both of these groups experience a much better outcome than epithelial ovarian cancers, with excellent survival and a manageable treatment-associated morbidity. There are other types of non-epithelial ovarian cancers such as sarcomas, lymphomas, small cell carcinomas or metastatic lesions to the ovary. These are rare entities and are not included in this chapter.