According to the distribution pattern of blood vessels and bile ducts in the liver, the liver is divided into two halves, the left and the right, with the right liver being larger than the left. The liver is the largest substantial organ in the body, and most of it is concealed on the right side under the diaphragm and deep surface of the ribs, with a small portion crossing the midline of the abdomen and reaching the left epigastrium. The lower right margin of the liver is flush with the right costal margin and the lower left margin can be palpated under the saber, but is usually in the midline of the abdomen, not exceeding the midpoint of the line connecting the saber and the umbilicus. The left and right hemispheres are clinically subdivided into the left outer lobe, left inner lobe, right anterior lobe, right posterior lobe, and caudate lobe, with the left outer lobe and right posterior lobe subdivided into upper and lower segments, and the caudate lobe also divided into left and right segments. Clinical studies have concluded that the regenerative capacity and potential of the liver are very high. In human terms, after a hepatectomy, it can generally repair, grow and return to its original weight in about a year. Therefore, when there is a limited lesion in the liver, hepatic segment, hemihepatic, or even a larger hepatectomy can be performed.