disease arises from structure disease arises from alteration in structure obsolete germ cell and embryonal cancer primitive neuroectodermal tumor primitive neuroectodermal neoplasm Editor note: TODO check relationship to neuroepithelioma primitive neuroectodermal tumor (PNET) ICDO:9473/3 EFO:0005235 ONCOTREE:PNET MONDO:0005462 NCIT:C3716 neuroectodermal neoplasm ICDO:9503/3 DOID:171 neuroectodermal tumor MEDGEN:64627 MESH:D017599 neuroectodermal tumour primitive neuroectodermal tumour (PNET) UMLS:C0206663 PNET A malignant neoplasm that originates in the neuroectoderm. The neuroectoderm constitutes the portion of the ectoderm of the early embryo that gives rise to the central and peripheral nervous systems and includes some glial cell precursors. primitive neuroectodermal tumor embryonal neoplasm nervous system cancer neuroepithelial neoplasm neurectoderm