[The echotomographic study of the vessels of the liver and the biliary tract (author's transl)].

As long as a clearly defined protocol is followed, exploration of the hepatic veins and biliary canals by echotomography (grey scale) is practically always possible. It should be incorporated in any echotomographic study of the hepatic parenchyma and reciprocally. This method of investigation is harmless, rapid, reproducible and low in cost.