Nonfunctional, nonchromaffin paragangliomas of the retroperitoneum.
D000328:Adult; D001859:Bone Neoplasms; D002648:Child; D006801:Humans; D008113:Liver Neoplasms; D008175:Lung Neoplasms; D008297:Male; D009362:Neoplasm Metastasis; D009378:Neoplasms, Multiple Primary; D010236:Paraganglioma, Extra-Adrenal / Q000473:pathology; D012186:Retroperitoneal Neoplasms / Q000473:pathology