Anatomy of the liver does not correspond to its functional anatomy, and does not include parts of portal triad and hepatic venous system and therefore is not adequate in clinical practice, especially in terms of planning eventual surgical resection. Couinaud's classification of liver segments, modified by the Bismuth, is used for a rapid, ultrasound evaluation, in which the liver is divided into eight segments. The possibility of a functional-anatomic segmentation of the liver, based on respect for the system of portal triad and hepatic vein, undoubtedly gives ultrasonography great importance to the planning of possible resection of liver segments, affected by the pathological process, with sparing of the remaining liver parenchyma.