Perinephric (perirenal) pseudocyst.
D000293:Adolescent; D006801:Humans; D052177:Kidney Diseases, Cystic / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery / Q000628:therapy; D008297:Male; D009393:Nephritis / Q000473:pathology; D011507:Proteinuria / Q000209:etiology; D014567:Urography