Source:http://linkedlifedata.com/resource/umls/id/C1333514
NCI: A spectrum of malignant tumors arising from the soft tissues, characterized morphologically by the presence of small round cells. Ewing sarcoma and peripheral primitive neuroectodermal tumor represent the ends of a spectrum, with Ewing sarcoma lacking evidence of neural differentiation and the markers that characterize the peripheral primitive neuroectodermal tumor. Ewing sarcoma and peripheral primitive neuroectodermal tumor may share cytogenetic abnormalities, proto-oncogene expression, cell culture and immunohistochemical abnormalities. Pain and the presence of a mass are the most common clinical symptoms.,NCI: Round cell sarcomas of soft tissue with varying degrees of neuroectodermal differentiation. There is a recurrent cytogenetic aberration, most commonly t(11;22)(q24;q12) and t(21;22)(q22;q12).