Longitudinal Blood Flow in Shared (Arteriovenous Anastomoses) and Non-Shared Cotyledons in Monochorionic Placentae

Blood flow through shared cotyledons was lower across gestation than through paired normal cotyledons in the placenta studied due to the smaller diameter of the AVA vessels. The size of AVAs rather than simply their presence and direction may contribute to determining transfusional imbalance in monochorionic twins.