Primary sarcoma of the retroperitoneum.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D005354:Fibrosarcoma / Q000601:surgery; D006801:Humans; D007890:Leiomyosarcoma / Q000601:surgery; D008080:Liposarcoma / Q000601:surgery; D008297:Male; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000601:surgery; D012509:Sarcoma / Q000175:diagnosis* / Q000601:surgery