Lymph nodes with clear borders and poorly defined dermatomal stroma may have lymph nodes, which are categorized into benign and malignant, and need to be further examined in a timely manner. 1. Benign lymph nodes: Normal lymph nodes will show clear oval shaped borders during imaging, and after inflammatory stimulation of the lymph nodes, it will cause congestion of the mucous membranes in the lymphatic area, and will be accompanied by an increase in the volume of lymph, which will show clear borders with poorly defined dermatomal texture. 2. Malignant lymph nodes: malignant tumors appear in lymphatic area, in the process of tumor growth, the lymphatic mucosa will be compressed, and also interfere with local blood circulation, resulting in lymphatic mucosal damage, which will show clear boundaries and poorly defined dermatomedulla after examination. Patients need to cooperate with the doctor to do enhanced CT examination, lymph node volume is relatively large, but also need to do pathological puncture detection, can be based on pathological results for clear diagnosis.