Retroperitoneal chemodectoma.
D006801:Humans; D008297:Male; D008875:Middle Aged; D010236:Paraganglioma, Extra-Adrenal / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery