Retroperitoneal cystic lymphangioma.
D000293:Adolescent; D000367:Age Factors; D006801:Humans; D008202:Lymphangioma / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D008297:Male; D011859:Radiography; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D012737:Sex Factors