Malignant lymph node ultrasound shows irregular morphology, abnormal echogenicity, abundant blood flow signals, etc. The sensitivity and specificity of ultrasound in diagnosing benign and malignant lymph nodes are limited, and it usually needs to be combined with other related examinations and pathologic examination as the final diagnosis. 1. Irregular morphology: malignant lymph nodes can be seen in irregular morphology on ultrasound, most of them are round-like, the internal structure is not clear, and the lymphatic gate cannot be clearly seen or is deviated from the middle position. 2. Abnormal echoes: ultrasound of malignant lymph nodes shows that the echoes of lymph nodes are lower than those of the surrounding muscles, and there are abnormal echoes such as scanty echoes and disappearing echoes. 3. Abundant blood flow signals: ultrasound of malignant lymph nodes shows that the blood flow signals in the lymph nodes are distributed in a messy way, and the blood flow signals are abundant, showing volcano blood flow, jet blood flow, etc., and the lymph nodes are fused with each other. It is recommended that patients listen to the doctor’s advice, improve the examination to clarify the diagnosis, and carry out targeted treatment.