The apparent drainage pattern of this patient is shown schematically. The inferior vena cava above the renals joins a large right ascending lumbar (hidden behind the IVC in this view). A large left ascending lumbar passes behind the aorta and joins the continuation of the right ascending lumbar in the midline. The common channel passes behind esophagus and trachea to cross above the right lung hilum and enter the posterior wall of the superior vena cava. The hepatic veins converge into a common channel which drains into the inferior aspect of the right atrium. The intrahepatic portion of the IVC is absent.
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