Obstructive periureteric venous ring.
D000293:Adolescent; D006801:Humans; D008297:Male; D014513:Ureter / Q000002:abnormalities*; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging / Q000209:etiology*; D014567:Urography; D014682:Vena Cava, Inferior / Q000002:abnormalities* / Q000196:embryology