Multiple Gestations Flashcards
Dizygotic
Dichorionic Diamniotic
Fraternal
Thick membrane
2 placentas
What will the donating twin on Twin Twin Transfusion Syndrome look like on UD
Oligohydramnios Small for gestational age Absent bladder IUGR Dilated heart
Monozygotic
Identical
Mono mono: most severe. 50% mortality
Mono di
Di di
Complications
Premie, PROM, htn, preeclampsia, SUA, IUGR, polyhydramnios, congenital anomalies, twin twin transfusion
Lambda sign / Twin peak sign
2 placentas. Projection
Conjoined twins occur after _ days
13
Twin twin transfusion
Abnormal shunting of blood from one fetus to the other.
Occurs mono chorionic twins
Mono mono or mono di
Donor: IUGR, oligo
Recipient: CHF, hydrop, poly
Weight discordance > 20%
Abnl Doppler
Conjoined Twins
70% female, poly, high mortality
Seen after 13 days
MC Thoracopagus and Omphalopagus
Craniopagus
Joined at head
Diprosopus
2 face 1 head
Dicephalus
2 heads 1 body
Parapagus
2 head 2 face 1 wide body.
Ischiopagus
Joined at ischium
Omphalopagus
Joined abd
Omphaloischiopagus
Abd & ischia
Pygopagus
Joined at butt
Superfecundation
2 eggs fertilized at different times within same cycle
Superfetation
2 eggs fertilized in different cycles
Thoracopagus
Joined at thorax
Thoracoomphalopagus
Joined thorax & abdomen
Vanishing twin
An embryonic GS
Fetal demise
Parasitic Twin / Fetus in Fetu
Found in Abd of sibling
Benign. Has spine parts.
TRAP sequence / Twin Reversal Arterial Perfusion / Parabolic Twin
Acardiac monster Mono chorionic Pump twin and acardiac twin Artery to artery communication Acardiac twin gets blood from normal twin. Upper body doesn't form. Pump twin may get CHF, 50% mortality
Fetus Papyraceus / Paper Doll Fetus
Have demise, separate sac. Oligo develops and gets flattened.
