Sail-shaped placenta

Sail placenta: In 1993, Fries et al. Pointed out that those with single chorionic pregnancy combined with sail placenta had more twin blood transfusions than non-combined ones. They believed that the membrane umbilical cord was susceptible to compression, and the amount of blood flowing through the umbilical vein to a twin was reduced. Excessive blood will flow to the other fetus through the placenta anastomosis, causing excessive amniotic fluid production, which in turn can cause a vicious cycle of umbilical vein compression. The author points out that puncture extraction of a large amount of amniotic fluid can not only relieve symptoms but also be treated as a direct cause. Sail placenta belongs to the pathogenesis of hemorrhagic anemia in newborns.