[Concept of the retroperitoneum and the pathology of tumors].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000145:classification / Q000473:pathology*; D012187:Retroperitoneal Space / Q000473:pathology*