Slightly low enhancement in the venous phase of the liver is a kind of CT examination result, which may be liver cancer or hepatic hemangioma. 1. Hepatocellular carcinoma: it is a kind of malignant tumor of liver, which is usually associated with liver fibrosis and cirrhosis, and low enhancement of liver can be seen in CT venous phase through examination. The disease mainly has symptoms such as pain in liver area, nausea and body weakness. 2. Hepatic hemangioma: it belongs to a kind of benign tumor of liver tissue, the etiology of the disease is not clear at present, mostly related to congenital developmental abnormality and hormonal stimulation, and low intensification of liver CT venous stage will be found through examination. The main symptoms of the disease are abdominal mass, loss of appetite and nausea. Slightly low enhancement in the venous phase of the liver may be benign tumors or malignant tumors, which should be consulted as soon as possible, and relevant examinations should be completed to confirm the cause of the disease and then appropriate treatment should be carried out.