Liver ultrasound can detect hepatocellular carcinoma, which usually appears as a low-density mass on ultrasound imaging, but is not very specific. For low-density masses detected by liver ultrasound, further enhanced CT is usually required clinically to understand whether the masses have enhancement shadow during enhanced CT, and combined with hematological indicators, such as whether AFP is significantly elevated, before clinical diagnosis of hepatocellular carcinoma can be made. For any kind of malignant tumors, including hepatocellular carcinoma, the diagnosis can be confirmed without pathological examination, including tissue puncture, pathological biopsy, or direct pathological examination after resection of the specimen to find malignant tumor cells. In other words, liver ultrasound can detect liver cancer, but the specificity is not high. The only way to confirm the diagnosis is to find liver cancer cells through pathological examination, and then the diagnosis of liver cancer can be made, otherwise only clinical diagnosis can be made.