RIU 435 Lecture Notes - Lecture 6: Conjoined Twins, Craniopagus Twins, Monochorionic Twins
30 Nov 2020
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Document Summary
Craniopagus (joined at cranium; syncephalus is conjoined twins with one head) Associated with increased incidence of fetal anomalies. If there is only one amniotic sac, twins mat entangle their umbilical cords, cutting off their blood supplies. In monochorionic diamniotic pregnancies, only two layers of amniotic sperature twins. Because circulations of monozygotic twins communicate through single placenta, they are at increased risk for syndrome known as twin to twin transfusion. If demise occurs very early, complete resorption of both embryo and gestational sac or early placenta may occur. Once reabsorbed, products of conception of this twin will no longer be seen on us. If fetus dies after reaching size too large for resorption, fetus markedly flattened from loss of fluid and most of soft tissue. When oligohydramnios exists in one sac and polyhydramnios in other. Small twin may appear stuck in position within uterus. Tts exists when there is arteriovenous shunt within placenta.
