title: Tumor extension to renal pelvis differentiates pediatric renal sarcomas.
authors.forename: Juan E
authors.initials: JE
authors.lastname: Sola
mesh_terms: D002454:Cell Differentiation; D002648:Child; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology*; D007682:Kidney Pelvis; D009362:Neoplasm Metastasis; D012509:Sarcoma / Q000473:pathology*