Venous return by the paraumbilical and hepatic veins in case of superior vena cava obstruction.

Pseudolesion in segment IV of the liver is a well-known diagnostic pitfall during arterial portography or even spiral computed tomography (CT) of the liver. It has suggested that this pseudolesion is the result of an abnormality in subsegmental perfusion. We report a case of an early dense contrast enhancement of segment IV of the liver by epigastric and paraumbilical veins in a patient with a superior vena cava obstruction. A pseudolesion in segment IV was observed in this patient on a spiral CT of the liver obtained during the portal phase.