Poorly defined borders are a description of the imaging presentation of liver nodules, but poorly defined borders do not necessarily indicate malignancy, only a predisposition to malignancy. However, poorly defined borders do not necessarily indicate malignancy, but only a tendency to malignancy. This is because the borders of benign tumors are relatively clear, such as liver cysts or liver hemangiomas. The boundary of malignant tumors is most likely unclear, without obvious boundary, such as the said hepatocellular carcinoma or bile duct cancer. However, there are some malignant tumors with clear borders, such as hepatocellular carcinoma with envelope or giant hepatocellular carcinoma, which have complete envelope and clear borders. Of course, tumors with unclear borders may also be benign tumors, such as liver abscesses, and some liver abscesses have edematous bands around the edges, which may be blurred on imaging and may be a sign of unclear borders. Poorly defined borders of liver nodules are not necessarily malignant, but it depends on the imaging results specifically and on the films.