Clear borders of lymph nodes usually mean that they are not metastases of malignant tumors, but usually represent normal lymph nodes or enlargement of lymph nodes due to localized infection and inflammation. In addition to clear borders, the shape of localized inflammation-induced enlargement is usually round or oval, and the mobility is relatively good. If the lymph nodes are enlarged due to metastasis, the borders are usually not clear, there may be adhesions with other soft tissues and the shape is not regular, and there may also be abnormal blood vessels or uneven density and other undesirable manifestations.