Liver nodule 5mm unclear boundary this situation may be cirrhosis, liver tumor disease and other causes. 1. Liver cirrhosis: If you suffer from viral hepatitis, alcoholic hepatitis, autoimmune liver disease and other liver diseases, if you fail to control it for a long time, it can lead to cirrhosis of the liver, resulting in the formation of pseudo lobe and cirrhotic nodules. 2. Liver tumor: it is a kind of tumor occurring in liver, which is divided into benign tumor and malignant tumor. Hepatic hemangioma, hepatic adenoma, etc. are benign tumors of liver; primary hepatocellular carcinoma, intrahepatic cholangiocellular carcinoma, etc. are malignant tumors of liver. When the boundary of liver nodule 5mm is not clear, relevant examination should be conducted under the guidance of doctor to determine the condition.