title: Primitive neuroectodermal tumor (peripheral neuroblastoma).
mesh_terms: D002111:Calcaneus; D002648:Child; D005534:Foot Diseases / Q000473:pathology*; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D009373:Neoplasms, Germ Cell and Embryonal / Q000648:ultrastructure*; D009447:Neuroblastoma / Q000032:analysis*; D012512:Sarcoma, Ewing / Q000648:ultrastructure