title: [Malignant primary retroperitoneal tumors. Report of 6 cases].
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging* / Q000401:mortality / Q000628:therapy; D014567:Urography
vernacular_title: Tumores retroperitoneales primitivos malignos. Presentación de seis casos.