title: Unusual ultrastructural features in alveolar rhabdomyosarcoma.
mesh_terms: D002466:Cell Nucleolus; D002467:Cell Nucleus; D002648:Child; D004721:Endoplasmic Reticulum; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology*; D008854:Microscopy, Electron; D009210:Myofibrils; D011132:Polyribosomes; D011650:Pulmonary Alveoli / Q000473:pathology*; D012208:Rhabdomyosarcoma / Q000473:pathology*; D012270:Ribosomes