<unk>  of the placenta during pregnancy is preceded by: * hydatidiform mole (50% of cases) * spontaneous abortion (20% of cases) * ectopic pregnancy (2% of cases) * normal term pregnancy (20–30% of cases) * hyperemesis gravidarum Rarely,<unk>  occurs in primary locations other than the placenta; very rarely, it occurs in testicles. Although trophoblastic components are common components of mixed germ cell tumors, pure<unk>  of the adult testis is rare. Pure<unk>  of the testis represents the most aggressive pathologic variant of germ cell tumors in adults, characteristically with early hematogenous and lymphatic metastatic spread. Because of early spread and inherent resistance to anticancer drugs, patients have poor prognosis. Elements of<unk>  in a mixed testicular tumor have no prognostic importance.<unk> s can also occur in the ovaries and other organs.
Choriocarcinoma
Embryoma
Embryonal carcinoma
Seminoma
Teratoma
Endometrioid tumor
Leiomyosarcoma
Adenomyoma