dichorionic diamniotic
Also written as: DCDA — dichorionic diamniotic
Type of twin pregnancy where each fetus has its own chorion and amnion, indicating separate placentas and amniotic sacs.
Full Definition
A twin pregnancy configuration where each fetus develops within its own chorionic and amniotic sac, representing the lowest-risk type of twin gestation. This occurs in all dizygotic (fraternal) twins and approximately 30% of monozygotic (identical) twins, depending on timing of embryonic splitting. Each fetus has independent placental circulation, eliminating risk of twin-to-twin transfusion syndrome. Ultrasound diagnosis relies on identification of the thick dividing membrane and the 'twin peak' or 'lambda' sign at the membrane-placental junction.
Usage
Usage note: Commonly abbreviated as DCDA; distinguish from MCDA (monochorionic diamniotic) which carries higher risks.
In Context
- "The ultrasound confirmed dichorionic diamniotic twins with appropriate growth in both fetuses." — Twin pregnancy assessment
- "Dichorionic diamniotic twins require routine monitoring but have lower complication rates than monochorionic pregnancies." — Maternal-fetal medicine consultation