Tumor border clear and border still clear are terms used to describe the tumor border to the naked eye as well as on imaging, and represent whether or not the tumor cells are invading the surrounding tissues. Malignant tumors are highly malignant and have a high mortality rate because of their ability to invade surrounding normal tissue cells. The ability of tumor invasion is reflected in the naked eye and imaging, and the most intuitive manifestation is whether the tumor border is clear. Generally speaking, if the description of the tumor border is “clear”, it means that the malignant tumor is surrounded by a complete envelope and has not yet invaded the surrounding tissues, or there are only invasive cancer cells that cannot be seen by the naked eye. If the description of the border is “unclear”, it means that the tumor cells have already invaded the surrounding tissues, and the scope of surgical resection has to be increased significantly, and chemotherapy and radiotherapy have to be assisted in the postoperative period. A clear border is in between.