Primary retroperitoneal tumors.
D000230:Adenocarcinoma; D002277:Carcinoma; D003560:Cysts; D005350:Fibroma; D005354:Fibrosarcoma; D006391:Hemangioma; D006801:Humans; D007889:Leiomyoma; D007890:Leiomyosarcoma; D008067:Lipoma; D008080:Liposarcoma; D008223:Lymphoma; D009455:Neurofibroma; D012186:Retroperitoneal Neoplasms; D012208:Rhabdomyosarcoma; D012509:Sarcoma