When you think of tumors, you will immediately think of cancer, and there is a misconception here that not all tumors are malignant. Still, let’s first understand what are the common liver tumors and the basic knowledge we need to know about liver tumors. Liver tumors are classified as primary and secondary. Primary liver tumors are divided into malignant and benign. Primary malignant liver tumors are divided into hepatocellular carcinoma derived from hepatocytes, cholangiocellular carcinoma derived from bile duct epithelium and mixed hepatocellular carcinoma derived from both, among which hepatocellular carcinoma derived from hepatocytes is the main type; primary benign liver tumors are mostly seen as hemangioma and cystic disease. Secondary liver tumors are all malignant and are metastases from other organs to the liver, or secondary intrahepatic metastases, so they are also called metastatic liver cancer.