Most common type of monozygotic twin pregnancy at 4th-8th day of cell division
In monozygotic twins, chorionicity depends upon time of cell division. Time of cell division Chorionicity of placenta First 72 hours post feilization(morula stage) DCDA 4-8th day(blastocyst stage) MCDA(MC type of monozygotic twins) 8-12th day MCMA >12th day Conjoined/Siamese twins, type of MCMA(fusion of embryonic disc occurs)
Twin Pregnancy, Molar Pregnancy, Gestational Trophoblastic disease and contraception in special situations (Sour Grapes!)
Monochorionic Monoamniotic twins with Siamese presentation
Monochorionic Monoamniotic(MO-MO) twins
Monochorionic Diamniotic twins(MO-DI)
Dichorionic Diamniotic twins (DI-DI)
Monochorionic Diamniotic twins(MO-DI)