title: Asymptomatic membranous obstruction of the inferior vena cava forming intrahepatic collateral pathways.
abstract: Intrahepatic and/or extrahepatic collateral pathways result from the membranous obstruction of the inferior vena cava. These collaterals are usually insufficient to prevent Budd-Chiari syndrome. We reprot an unusual case of asymptomatic membranous obstruction of the inferior vena cava in which marked intrahepatic collateral pathways were formed. Although the inferior vena cava terminated above the orifice of the right hepatic vein, the middle and left hepatic veins were patent above the membrane, without narrowing. Blood from the inferior vena cava drained into the right atrium via the intrahepatic collaterals between the right and middle hepatic veins without resistance.
authors.affiliation: Department of Radiology, Saiseikai Gotsu General Hospital, Gotsu, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kamba
authors.forename: S
authors.initials: S
authors.lastname: Ochi
authors.forename: H
authors.initials: H
authors.lastname: Ochi
authors.forename: S
authors.initials: S
authors.lastname: Maruyama
authors.forename: H
authors.initials: H
authors.lastname: Sato
authors.forename: Y
authors.initials: Y
authors.lastname: Suto
mesh_terms: D000368:Aged; D006502:Budd-Chiari Syndrome / Q000175:diagnosis* / Q000209:etiology; D003097:Collateral Circulation / Q000502:physiology*; D003251:Constriction, Pathologic / Q000175:diagnosis / Q000503:physiopathology; D006503:Hepatic Veins; D006801:Humans; D008099:Liver / Q000098:blood supply*; D008297:Male; D016491:Peripheral Vascular Diseases / Q000175:diagnosis / Q000503:physiopathology; D014654:Vascular Patency / Q000502:physiology; D014682:Vena Cava, Inferior