title: Primary retroperitoneal tumors.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000792:Angiography; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008220:Lymphography; D008297:Male; D008875:Middle Aged; D010690:Phlebography; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery; D012188:Retropneumoperitoneum