The liver is a very important organ of the human body, for the normal growth and metabolism of the human body has a very important role, the general anatomy, according to the distribution characteristics of the portal system, according to the clockwise direction of the liver is divided into eight liver segments. Each liver is labeled with Roman numerals I-VIII, with segment I being the caudate lobe, segment II being the upper left outer lobe, segment III being the lower left outer lobe, segment IV being the left inner lobe, segment V being the lower right anterior lobe, segment VI being the lower right posterior lobe, segment VII being the upper right posterior lobe, and segment VIII being 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.