dichorion
Dichorion is a term used in obstetrics to describe a twin pregnancy in which each fetus has its own chorion, the outer fetal membrane that contributes to the placenta. In practical terms, dichorionic pregnancies most often correspond to dichorionic-diamniotic twins, where there are two chorions and typically two amniotic sacs with separate placental circulations, though placental tissue can be fused or overlapped in some cases.
Most dichorionic twins are dizygotic, arising from two separate fertilized eggs. Monozygotic twins can also be
Diagnosis is usually made by ultrasound in the first or early second trimester. A classic indicator of
Clinical significance includes a generally lower risk of twin-twin transfusion syndrome compared with monochorionic twins, but