What is yolk sac tumor with mature teratoma?

Also known as: yolk sac tumor, YST, endodermal sinus tumor, mature cystic teratoma, dermoid cyst

A yolk sac tumor and a teratoma are both categorized as germ cell tumors, which means they develop in the reproductive cells of the body. In the case of a yolk sac tumor, it develops in the cells that line the yolk sac of the embryo and is malignant (cancerous). A mature teratoma is usually benign (non-cancerous) and contains fragments of other body parts within the growth. In some cases, these two tumors can occur with one another.

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Reviewed by: Maggie Fader, MD

This page was last updated on: 1/29/2019 3:21:13 PM