title: [RETROPERITONEAL TUMORS].
mesh_terms: D005350:Fibroma; D005354:Fibrosarcoma; D005853:Geriatrics; D006801:Humans; D007889:Leiomyoma; D012186:Retroperitoneal Neoplasms; D012509:Sarcoma
keywords: FIBROMA; FIBROSARCOMA; GERIATRICS; LEIOMYOMA; RETROPERITONEAL NEOPLASMS; SARCOMA
vernacular_title: TUMORES RETROPERITONEALES.