malignant teratoma

The term "malignant teratoma" has sometimes been used as a synonym for nonseminomatous germ cell tumor.

Because they are encapsulated, teratomas are usually benign, although several forms of malignant teratoma are known and some of these are common forms of teratoma.

Chretien PB, Milam JD, Foote FW, et al.: Embryonal adenocarcinomas (a type of malignant teratoma) of the sacrococcygeal region.