[Ultrastructural observation of classical primary osteosarcoma].
D000293:Adolescent; D000328:Adult; D001859:Bone Neoplasms / Q000648:ultrastructure*; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D012516:Osteosarcoma / Q000648:ultrastructure*