What is the difference between a teratoma and a blastoma?

Separate tumors: A teratoma is a tumor with tissue from an organ resembling normal derivatives of more than one germ layer. They may contain hair, teeth, bone and, very rarely, more complex structures They are usuallly benign . The Blastoma is a tumor thought to arise in embryonic tissue and becomes associated with part of the name of the organ from which it was derived such as neuroblastoma, glioblastoma.