In interventional treatment, in addition to the normal hepatic artery blood supply, hepatocellular carcinoma often has an abnormal extrahepatic blood supply, which, if not handled properly, often leads to incomplete tumor embolization treatment and makes it difficult to receive better results. Therefore, the recognition and intraoperative search for extrahepatic blood supply of hepatocellular carcinoma can undoubtedly help improve the efficacy of interventional surgery. Types of extrahepatic arteries: 1. Normal hepatic artery variants, i.e. alternative hepatic arteries such as right hepatic artery from superior mesenteric artery, right hepatic artery from abdominal trunk and left hepatic artery from left gastric artery, etc. 2, parasitic blood supply Normal hepatic artery case that already exists, such as the right inferior phrenic artery, adrenal artery, etc.. Therefore, it can be detected by imaging during the first hepatic artery embolization. 3. Collateral circulation blood supply The extrahepatic collateral circulation is opened due to stenosis or occlusion of the hepatic artery. For example, gastroduodenal and omental arteries, pancreaticoduodenal artery arch, right colonic artery, internal mammary artery and intercostal artery are all included in this category.