Ultrasound cannot detect all liver metastatic lesions, and if ultrasound does not detect them, it is recommended to undergo further tests to confirm the diagnosis. Liver metastatic tumors appear as single or multiple hyperechoic foci on ultrasound, which can also observe the location and size of the tumor and whether there is any infiltration of blood vessels. However, not all liver metastatic lesions can be detected by ultrasound, and it is easy to miss or misdiagnose those small lesions or atypical symptoms. At this time, further examination can be conducted to help diagnose the disease, and commonly used clinical examinations include magnetic resonance imaging, CT, puncture biopsy, etc., which need to be standardized under the guidance of the doctor.