What is polyspermy?

In younger children, extragonadal extracranial germ cell tumors usually occur at birth or in early childhood. Most of these tumors are teratomas in the sacrum ... Nov 16, 2001 ... This document describes when research activities involving human embryonic stem cells (hESCs), human embryonic germ cells derived from fetal tissue, Testicular cancers start in germ cells. These are cells in the testicles that make sperm. These tumors often start in the testicles. Germ cell tumors that develop in the brain or spinal cord are also called CNS (central nervous system) germ cell tumors. Most germ cell tumors are treated with chemotherapy along with radiation therapy. Chemotherapy Treatment Radiation therapy Surgery Apr 19, 2019 ... histologic subtypes share a common cell of origin. For example: – “Germ cell theory”: Primordial germ cells mismigrate during embryonic ... Mar 11, 2025 ... Germ cell tumors are growths of cells that form from reproductive cells called germ cells. In the female reproductive system, germ cells turn ... Provides guidance on controversial issues surrounding the diagnosis, treatment and follow-up of early- and late-stage testicular cancer. Ovaries of reproductive-age women, like adult mice, possess rare mitotically-active germ cells that can be propagated in vitro as well as generate oocytes in ... Extragonadal germ cell tumors have a variable clinical course, with the potential for aggressive behavior and widespread metastases. The imaging characteristics ...