A malignant germ cell tumor arising from the ovary. Morphologically, it is identical to seminoma and consists of a monotonous population of germ cells with abundant pale cytoplasm and uniform nuclei. The stroma invariably contains chronic inflammatory cells, mostly T-lymphocytes. It responds to chemotherapy or radiotherapy and the prognosis relates to the tumor stage. The disease is MONDO_0003481 (dysgerminoma of ovary). Also known as: dysgerminoma of the ovary, germ cell dysgerminoma of ovary, germ cell dysgerminoma of the ovary, ovarian dysgerminoma, ovarian germ cell dysgerminoma, ovary dysgerminoma (disease).