Dichorionic
By Pamela Prindle Fierro, About.com Guide
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STUDY DESIGN: Structurally and chromosomally normal dichorionic twin gestations resulting in two live births after 24 weeks gestation were identified.
Dichorionic twins: If the babies have separate placentas, each will have an amnion and a chorion, so the membranes between them will be four layers thick and easy to see.
Dichorionic - A situation in which twins develop in their own sac during fetal development. All fraternal twins are dichorionic.
Not all dichorionic (DC) twins are dizygotic (DZ).
Like-sexed dichorionic (DC) twins need testing for zygosity.
There are three ways identical twins can exist in the uterus: dichorionic-diamniotic twins; monochorionic-diamniotic twins; monochorionic-monoamniotic twins.
Dichorionic/Diamniotic
Split occurs before the yolk sac is formed:
Each twin has his/her own placenta
Monochorionic/Diamniotic
Split occurs a day or two after yoke sac formation: ...
Twins in separate sacs (diamniotic) and with separate placentas (dichorionic) are the most common type of twins. They account for about 75% or more of all twins. In general, these twins have the lowest risks for pregnancy complications.
On ultrasound examination the presence of a triangular projection of placental tissue extending between two amniotic sacs. The twin peak sign strongly indicates that there are two separate placentas (dichorionic).
 See also: Pregnancy, Pregnant, Multip, Monochorionic, Fetus
  
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