A rare malignant germ cell tumour of ovary arising from germ cells in the ovary, frequently unilateral at diagnosis, usually presenting during adolescence with pelvic mass, fever, vaginal bleeding and acute abdomen, with certain subtypes being occasionally associated with isosexual precocity, virilisation, hyperthyroidism or carcinoid syndrome. Histologically they comprise the following: embryonal carcinoma, yolk sac tumour, polyembryoma and mixed germ cell tumour. [from
SNOMEDCT_US]