title: Tumors of the retroperitoneum.
mesh_terms: D000328:Adult; D000368:Aged; D003560:Cysts / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D005350:Fibroma / Q000473:pathology; D005354:Fibrosarcoma / Q000473:pathology; D005729:Ganglioneuroma / Q000473:pathology; D006393:Hemangiopericytoma / Q000473:pathology; D006394:Hemangiosarcoma / Q000473:pathology; D018219:Histiocytoma, Benign Fibrous / Q000473:pathology; D006801:Humans; D007889:Leiomyoma / Q000473:pathology; D007890:Leiomyosarcoma / Q000473:pathology; D008067:Lipoma / Q000473:pathology; D008080:Liposarcoma / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009442:Neurilemmoma / Q000473:pathology; D009447:Neuroblastoma / Q000473:pathology; D010236:Paraganglioma, Extra-Adrenal / Q000473:pathology; D011859:Radiography; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D012187:Retroperitoneal Space / Q000196:embryology