A<unk>  is a type of germ cell tumor; it usually is malignant and usually occurs in the ovary. A tumor of the identical histology but not occurring in the ovary may be described by an alternate name: seminoma in the testis or germinoma in the central nervous system or other parts of the body.<unk>  accounts for less than 1% of ovarian tumors overall.<unk>  usually occurs in adolescence and early adult life; about 5% occur in pre-pubertal children.<unk>  is extremely rare after age 50.<unk>  occurs in both ovaries in 10% of patients and, in a further 10%, there is microscopic tumor in the other ovary. Abnormal gonads (due to gonadal dysgenesis and androgen insensitivity syndrome) have a high risk of developing a<unk> . Most<unk> s are associated with elevated serum lactic dehydrogenase (LDH), which is sometimes used as a tumor marker.
Dysgerminoma
Gonadoblastoma
Immature teratoma
Seminoma
Sex cord–gonadal stromal tumour
Leydig cell tumour
Germinoma
Trichoblastoma