Retroperitoneal cystic lymphangioma.
D006801:Humans; D008202:Lymphangioma / Q000000981:diagnostic imaging*; D008220:Lymphography; D008297:Male; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000000981:diagnostic imaging*; D014054:Tomography; D014463:Ultrasonography