Which ligament forms the boundary between the caudate lobe and the left lobe medial segment (quadrate) and appears as a thin echogenic line anterior to the caudate lobe?

Which ligament forms the boundary between the caudate lobe and the left lobe medial segment (quadrate) and appears as a thin echogenic line anterior to the caudate lobe?

• A. Coronary ligament
• B. Falciform ligament
• C. Ligamentum venosum
• D. Ligamentum teres

Answer: (C)

The boundary between the caudate lobe and the left lobe’s medial segment (quadrate) is marked by the ligamentum venosum. This fibrous remnant of the fetal ductus venosus runs along a fissure on the liver’s visceral surface, extending from the porta hepatis toward the inferior vena cava. On ultrasound, it appears as a thin echogenic line anterior to the caudate lobe, highlighting the separation between the caudate and the left lobe. The falciform ligament sits more anteriorly, separating the left and right lobes on the diaphragmatic/anterolateral surface and contains the ligamentum teres, while the coronary ligaments are peritoneal reflections around the liver’s edges and do not define this particular boundary.

The boundary between the caudate lobe and the left lobe’s medial segment (quadrate) is marked by the ligamentum venosum. This fibrous remnant of the fetal ductus venosus runs along a fissure on the liver’s visceral surface, extending from the porta hepatis toward the inferior vena cava. On ultrasound, it appears as a thin echogenic line anterior to the caudate lobe, highlighting the separation between the caudate and the left lobe. The falciform ligament sits more anteriorly, separating the left and right lobes on the diaphragmatic/anterolateral surface and contains the ligamentum teres, while the coronary ligaments are peritoneal reflections around the liver’s edges and do not define this particular boundary.