As people become more aware of medical checkups, ultrasound examinations are convenient and popular, and it is very common for people to go to the hospital and have an ultrasound done by the doctor. When the ultrasound result indicates “liver cyst” or “liver hemangioma”, many people think they have a tumor in their liver, so they are emotionally devastated and don’t know what to do. According to the growth characteristics of tumors and their impact and harm to human body, tumors can be divided into two categories: benign and malignant. There is no absolute boundary between benign tumors and malignant tumors. Malignant tumors with the lowest degree of malignancy are similar to benign tumors, and some benign tumors can also pose great harm to human body because they grow around important organs. The term cancer refers to malignant tumors, and the term patient refers to patients with malignant tumors in general. According to different sources of tumor tissues, liver tumors are classified as follows: 1. benign tumors: hepatocellular adenoma, hepatocellular adenoma, adrenal remnant tumor, hemangioma, malignant tumor, other benign tumors such as mesodermal tissues (lipoma, fibroma, mixed tumor, etc.) 2. Malignant tumors: (primary tumors), hepatocellular carcinoma, cholangiocarcinoma, adrenal remnant carcinoma, angiosarcoma, other sarcomas (metastatic tumors) metastatic cancer metastatic sarcoma. The main difference between benign tumor and malignant tumor: 1. Growth mode: benign tumor is swelling growth, with clear boundary and mostly with envelope formation. Malignant tumors are infiltrative and destructive growth, with unclear boundary and no envelope formation. 2.Growth speed: benign tumors grow slowly. Malignant tumor generally grows rapidly, with significant restlessness and often necrosis and ulceration. 3.Recurrence: benign tumors often do not recur after surgery. Malignant tumors are prone to recurrence after surgery. 4.Metastasis: benign tumors do not metastasize. Malignant tumors may metastasize to other parts of the body through lymphatic tracts and blood channels. 5.Degree of differentiation and tissue structure: The differentiation form of benign tumor cells is similar to normal tissues, and the tissue structure is also similar to the original normal tissues. The differentiation degree of malignant tumor cells is inconsistent and often shows different degrees of interstitial changes. The tissue structure is different from the original normal tissue. 6.Impact on human body: benign tumor is mainly for local compression effect, which generally has small impact (in some special parts, it can compress important organs and affect their functions, thus causing serious consequences). In addition, tumors of certain endocrine organs can cause hyperfunction. In addition to local compression, malignant tumors often destroy and infiltrate adjacent organs and tissues, causing necrosis and ulceration, bleeding, infection and distant metastasis, or causing cachexia, which is very dangerous to life.