Ultrasonography of liver tumors involves two stages: detection and characterization.Tumor detection is based on the performance of the method and should include morphometric information (three axes dimensions, volume) and topographic information (number, location specifying liver segment and lobe/lobes). The specification of these data is important for staging liver tumors and prognosis.Tumor characterization is a complex process based on a sum of criteria leading towards tumor nature definition. [Source: Wikipedia ]