The liver is a very important organ of the human body, and has a very important role in the normal growth and metabolism of the human body. In general anatomy, according to the distribution characteristics of the portal system, the liver is divided into eight hepatic segments according to the clockwise direction, and each liver is respectively labeled with Roman numerals Ⅰ – Ⅷ. Ⅰ segment is the caudate lobe, Ⅱ segment is the upper segment of the left outer lobe, Ⅲ segment is the lower segment of the left outer lobe, Ⅳ segment is the left inner lobe, Ⅴ segment is the lower segment of the right anterior lobe, Ⅵ segment is the lower segment of the right posterior lobe, Ⅶ segment is the upper segment of the right posterior lobe. Segment VI is the lower right posterior lobe, segment VII is the upper right posterior lobe, and segment VIII is the upper right anterior lobe. This method of division is of great significance for CT imaging diagnosis and surgery, and the S8 segment of the liver should refer to the eighth segment, which is the upper right anterior lobe.