The hepatic S4 segment is located mainly in the upper part of the left liver. There are individual differences depending on the height and weight of the patient. The liver is usually divided into 8 segments, and hepatic segment S4 is located in the medial part of the left liver. The left medial lobe segment is subdivided into two parts, the upper left medial lobe segment S4a and the lower left medial lobe segment S4b, which are mainly located in the area between the hepatic venous fissure and the middle hepatic vein. Hepatic segment S4 is localized mainly by imaging such as ultrasound, CT and MRI and is found mainly in the upper part of the left liver. Since individuals are all different in height and weight, the exact location of the liver segments varies somewhat. If you experience any discomfort in the liver area, please go to a regular hospital in time and actively diagnose and treat under the guidance of a doctor to avoid delaying your condition.