The blurring of the border of low-density foci in the liver may be caused by liver abscess, liver malignant tumor, etc., which need to be analyzed specifically. 1. Liver abscess: Liver abscess is a purulent inflammation of the liver, which can be manifested as a low-density foci with blurred boundaries, and the clinical manifestations include high fever, pain in the liver area, nausea, vomiting and other symptoms. Small abscess cavity can be treated by drugs such as ornidazole, and large abscess cavity can be drained by puncture or surgical incision. 2. Malignant tumor of liver: imaging may show in low density foci with fuzzy boundary, but tumor indexes such as alpha-fetoprotein and CA199 may also be elevated. Early stage may be asymptomatic, and late stage may have symptoms such as pain in liver area, jaundice, low-grade fever, loss of appetite and so on. Symptoms should go to the hospital in time to improve the relevant examination and standardize the treatment under the doctor’s guidance to avoid delaying the condition.