Primary mixed germ cell tumor arising in the pancreatic head.

Germ cell tumors, comprised of gonadal and extra-gonadal types, are relatively rare tumors arising from primordial germ cells. Extra-gonadal germ cell tumors have been reported to occur at many non-gonadal locations, from the brain to the sacrococcygeal region. However, primary germ cell tumors in the pancreas are extremely rare. Herein, we present the first case of a 12-month-old girl with a primary mixed germ cell tumor, consisting of both endodermal sinus tumor and mature teratoma, in the pancreatic head.