ABSTRACT
Cavai Fold This peritoneal reflection from the coronary ligament to the renal anastomosis (Figure 1) forms the upper boundary of the epiploic foramen (of Winslow). It is present at 4 weeks, when the primordium of the lesser sac has just appeared in the dorsal mesogastrium. In the fetus, the cavai fold bridges the gap between the bare area of the liver and the IVC (Figure 4). By expanding into the cavai fold, liver substance reaches the hepatic part of the IVC, and may in exceptional cases engulf it. It is emphasized that the liver and its ligaments develop wholly in the ventral mesogastrium.
