Primary liver cancer refers to malignant tumors that originate in the liver, while metastatic liver cancer refers to cancers that start in other parts of the body and then spread to the liver through lymphatic and blood circulation, among other routes. Another difference is that primary liver cancer is more likely to be a single lesion, while metastatic liver cancer generally involves multiple lesions. Regarding the differences between primary and metastatic liver cancer, their treatment methods also differ. For primary liver cancer, interventional chemotherapy or surgery, such as hepatic lobectomy, can be performed if the tumor is small. In contrast, metastatic liver cancer usually involves multiple lesions, making surgery alone challenging. Additionally, the primary tumor also requires treatment.