Intrahepatic venous collaterals develop in Budd-Chiari syndrome, hepatomas, and other tumors if the hepatic veins are obstructed. In portal hypertension hepatic vein-to-vein anastomoses develop without obstruction of the hepatic veins. In a 53-year-old woman with giant cavernous hemangioma of the liver, hepatic venography demonstrated remarkable hepatic vein-to-vein anastomoses in the periphery of the hepatic veins without venous obstruction, accompanied with low wedged hepatic vein pressure.

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... e hemodynamic change of the liver may cause this abnormality because of the large blood space of the hemangioma. Pathological examination of the resected liver apart from the tumor confirmed numerous deformations and dilatations of the central veins not found in the normal liver, in the area of hepatic vein-to-vein anastomoses shown by venography. Clinically, atypical hepatic resection is possible by maintaining a drainage vein to preserve as much of the normal liver as possible. Hepatic venography, as well as hepatic angiography, gives important information about the liver.