What is immature teratoma testicular cancer?
Immature teratoma testicular cancer is a less-well developed cancer with cells that look like those of an early embryo. I was reading on the American Cancer Society website that this type of cancer is more likely to grow into surrounding tissues and to spread outside the testicle than mature teratomas, which are generally benign.
They also say that immature teratoma testicular cancer can sometimes come back years after treatment.

