peripheral neuroepithelioma of soft tissue belongs to the group of peripheral neuroectodermal tumors ( pnets ) , but because of its clinical , biological , and morphological characteristics , it differs from other small , round-cell sarcomas that appear in children ( neuroblastoma ) or in the thoracopulmonary region ( askin 's tumor ) and bone ( peripheral neuroectodermal sarcoma of bone ) .
C0877849
askin 's tumor
C1518271
neuroectodermal