title: [Primary retroperitoneal tumors (apropos of 5 cases). I].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001706:Biopsy; D006801:Humans; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000145:classification / Q000175:diagnosis* / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed
vernacular_title: Tumori retroperitoneali primitivi (a proposito di 5 osservazioni). Parte I.