title: Circumaortic venous ring: incidence and significance.
abstract: A left circumaortic renal vein was found in 11% of 74 left renal venograms, an incidence similar to that at autopsy. Cavography proved to be an unsatisfactory method of demonstrating the renal veins. Prior knowledge of a venous ring is important when blood samples from the adrenal or renal veins are to be collected. When caval interruption is planned, a circumaortic venous ring may provide a fully developed collateral pathway immediately after surgery if the procedure is planned without awareness of its presence.
mesh_terms: D000015:Abnormalities, Multiple / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000601:surgery; D000328:Adult; D001012:Aorta, Abdominal / Q000002:abnormalities; D001165:Arteriovenous Malformations / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000601:surgery; D005260:Female; D006801:Humans; D008026:Ligation; D010690:Phlebography; D011655:Pulmonary Embolism / Q000209:etiology; D012082:Renal Veins / Q000002:abnormalities* / Q000000981:diagnostic imaging; D014682:Vena Cava, Inferior / Q000002:abnormalities / Q000000981:diagnostic imaging / Q000601:surgery