primitive neuroectodermal tumor primitive neuroectodermal neoplasm 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 obsolete_primitive neuroectodermal tumor