Multiple round-like hypointense shadows seen in the liver should be differentiated into two cases: 1. Benign lesions of the liver. For this case, it is more likely that the patient is a polycystic liver or multiple liver cysts. In this case, the patient should further investigate the CT or MRI of the upper abdomen to further clarify the nature of the patient’s liver hypoechoic mass. 2. For patients with previous tumor diseases, we should consider whether there are metastatic lesions of tumors. For patients with rectal and colon diseases, especially tumor patients, if there is a hypoechoic mass in the liver. At this time, we should further investigate the enhanced CT and MRI of the upper abdomen, and if necessary, do PET-CT examination to further determine whether the hypoechoic masses in the liver are cysts or formed due to tumor metastasis. For patients with metastatic tumors, if it is a single metastatic tumor in the liver combined with an occupying lesion in the rectum or colon, combined resection can be considered. However, if the mass is multiple, the possibility of systemic intravenous chemotherapy should be considered.