|Classification and external resources
An immature teratoma is a rare type of malignant (cancerous) germ cell tumor (type of tumor that begins in the cells that give rise to sperm or eggs).
Like a mature teratoma, it contains several different types of tissue such as hair, muscle, and bone. Unlike a mature teratoma, it contains primitive neuroepithelium.
This article incorporates public domain material from the U.S. National Cancer Institute document "Dictionary of Cancer Terms".