The liver is the largest organ in the human body, with most of it located in the upper right part of the abdominal cavity and a small portion in the upper middle part of the abdomen. The liver is similar in shape to an irregular triangle and is generally divided into five lobes and eight segments. The right lobe is large and bluntly thick, while the left lobe is smaller and narrower. The upper protrusion of the liver is rounded and attached to the diaphragm, about the 5th intercostal space of the right chest, while the lower part of the liver is flatter, and the neighboring organs underneath it are the gallbladder, the stomach and duodenum, the colon, and the kidneys. When examined and touched, the edge of the lower border of the liver generally does not exceed the lower edge of the ribs, so under normal circumstances, the adult liver is not palpable under the rib margin, but the subxiphoid process can be palpated. In children, the liver is usually palpable under the rib cage, because the liver is relatively large in children and the abdominal wall is soft and thin, so it is easy to palpate. The liver has a certain degree of mobility in the abdominal cavity, and can move up and down with breathing, visceral activity and changes in body position, so the size of the liver may be slightly different at different times or by different doctors.