Liver hypodensity shadow with clear border and mild enhancement, considering the possible existence of liver cysts, liver hemangioma, liver malignant tumor, etc.. 1. Liver cysts: cysts of the liver are benign tumors, in the clinic, attention should be paid to regular ultrasound for review, most of the patients with liver cysts do not have obvious symptoms, and some of them have abdominal distension, abdominal pain, and so on. 2. hemangioma of liver: when confirming the diagnosis of hemangioma of liver, the growth rate and size of hemangioma also need to be assessed. 3. Malignant tumors of liver: Malignant tumors of the liver may also present as hypodense shadows, and patients may also present with symptoms such as right upper abdominal distension, weight loss, and jaundice. It is recommended to consult the Department of Hepatobiliary Surgery of regular hospitals if low-density shadow is found in the liver.