The common diseases include hepatic hemangioma and hepatocellular carcinoma. 1. Hepatic hemangioma: enhancement of the lesion in the early stage is not strengthened, showing low density, but the lesion may be strengthened in the portal and delayed stages. In the arterial stage of enhancement, the edge of the lesion is speckled with enhancement. 2. Primary hepatocellular carcinoma: vascular invasion and portal vein thrombus are clearer in portal stage, and there may be enhanced nodules on the wall of portal vein. When there is thrombus formation in the main trunk of portal vein, many strengthened, twisted and tiny side-branching blood vessel shadows can be seen in the portal region of the liver. In diffuse hepatocellular carcinoma with portal vein thrombus, the degree of enhancement of liver parenchyma decreases, and sometimes it is not easy to define the boundary and number of lesions, while early enhancement may show multiple enhancing nodular shadows all over the liver. 3. In addition to the above diseases, cirrhotic nodules may also be manifested as multiple inhomogeneous intensified nodules in the liver during imaging examination. The above examination results alone cannot determine the cause accurately, and it is necessary to combine with the characteristics of the medical history and other examination results to make an accurate judgment, and it is recommended to clarify the cause of the disease under the guidance of the doctor.