Abnormal perfusion within the liver refers to abnormal blood flow between segments and lobes of the liver caused by various reasons. Hepatic abnormal perfusion can be categorized into three types: diffuse, lobar-hepatic segmental, and wedge-shaped lamellar according to the different manifestations within the liver parenchyma. 1. Diffuse type: the arteries in the area of abnormal perfusion show irregular high signals, which are multiple and of different sizes in the hepatic parenchyma, and are patchy or similar to round shapes. 2. Hepatic lobe and segmental type: high signal abnormality in the hepatic lobe or segment. 3. Wedge-shaped flaky type: wedge-shaped or flaky abnormal perfusion at the edge of the liver or at the edge of the intrahepatic lesion. Diseases with abnormal perfusion in the liver include cirrhosis, portal vein embolism, liver tumor, and hepatic artery rupture. Patchy intensified foci of abnormal perfusion within the liver is an imaging test of the liver, and the doctor will clarify the specific cause of the abnormal perfusion of the liver based on the patient’s clinical symptoms, and treat the cause of the disease.