<unk>  is a group of<unk> s derived from the<unk>  component of the ovary and testis, which comprises the granulosa, thecal cells and fibrocytes. In contrast, the epithelial cells originate from the outer epithelial lining surrounding the gonad while the germ cell<unk> s arise from the precursor cells of the gametes, hence the name germ cell. In humans, this group accounts for 8% of ovarian cancers and under 5% of testicular cancers. Their diagnosis is histological: only a biopsy of the<unk>  can make an exact diagnosis. They are often suspected of being malignant prior to operation, being solid ovarian<unk> s that tend to occur most commonly in post menopausal women. This group of<unk> s is significantly less common than testicular germ cell<unk> s in men, and slightly less common than ovarian germ cell<unk> s in women (see Ovarian cancer).
Sex cord–gonadal stromal tumour
Sertoli cell tumour
Granulosa cell tumour
Germ cell tumor
Ovarian germ cell tumors
Dysgerminoma
Leydig cell tumour
Gonadoblastoma