Extrarenal Wilms tumor.
D002648:Child; D002828:Choristoma / Q000196:embryology / Q000473:pathology*; D006801:Humans; D007668:Kidney / Q000196:embryology*; D008297:Male; D012186:Retroperitoneal Neoplasms / Q000196:embryology / Q000473:pathology*; D009396:Wilms Tumor / Q000196:embryology / Q000473:pathology*