NCIt definition : A germ cell tumor arising in an anatomic site other than the testis or ovary (e.g.,
central nervous system, lung, mediastinum, and retroperitoneum).;
Alternative definition : NCI-GLOSS: A rare cancer that develops in germ cells that are found in areas of the
body other than the ovary or testicle (such as the brain, chest, abdomen, or tailbone).
Germ cells are reproductive cells that develop into sperm in males and eggs in females.; NICHD: A neoplasm arising from gonadal tissue outside the ovary or testes.;