primitive neuroectodermal tumor peripheral primitive neuroectodermal tumor https://github.com/monarch-initiative/mondo/issues/4039 Orphanet:370348 peripheral neuroepithelioma peripheral neuroectodermal tumour peripheral neuroectodermal neoplasm UMLS:C0684337 peripheral primitive neuroectodermal neoplasm PPNET Other ontologies classify peripheral neuroepithelioma as a separate class but NCIT treats these as synonyms and we aim to follow NCIT here. (See HP:0006717, SNOMED:254764001, the "included" disease concept on OMIM:612219, and UMLS:C3489398). peripheral neuroectodermal tumor peripheral PNET GARD:0017601 NCIT:C9341 MEDGEN:151926 MONDO:0018271 pPNET peripheral primitive neuroectodermal tumor A small round cell tumor with neural differentiation arising from the soft tissues or bone. NANDO:2200055 NANDO:2200054 ICDO:9364/3 Ewing sarcoma/peripheral primitive neuroectodermal tumor bone sarcoma peripheral nervous system cancer