A<unk>  is a complex neoplasm composed of a mixture of gonadal elements, such as large primordial germ cells, immature Sertoli cells or granulosa cells of the sex cord, and gonadal stromal cells.<unk> s are by definition benign, but more than 50% have a co-existing dysgerminoma which is malignant, and an additional 10% have other more aggressive malignancies, and as such are often treated as malignant.
Gonadoblastoma
Luteoma
Trichoblastoma
Pineal gland cyst
Ovarian fibroma
Seminoma
Leydig cell tumour
Theca lutein cyst