Multiple Gestations

Question 0

Dizygotic

Answer 0

Dichorionic Diamniotic
Fraternal
Thick membrane
2 placentas

Question 1

What will the donating twin on Twin Twin Transfusion Syndrome look like on UD

Answer 1

Oligohydramnios 
Small for gestational age
Absent bladder
IUGR
Dilated heart

Question 2

Monozygotic

Answer 2

Identical

Mono mono: most severe. 50% mortality
Mono di
Di di

Question 3

Complications

Answer 3

Premie, PROM, htn, preeclampsia, SUA, IUGR, polyhydramnios, congenital anomalies, twin twin transfusion

Question 4

Lambda sign / Twin peak sign

Answer 4

2 placentas. Projection

Question 5

Conjoined twins occur after _ days

Answer 5

13

Question 6

Twin twin transfusion

Answer 6

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

Question 7

Conjoined Twins

Answer 7

70% female, poly, high mortality
Seen after 13 days

MC Thoracopagus and Omphalopagus

Question 8

Craniopagus

Answer 8

Joined at head

Question 9

Diprosopus

Answer 9

2 face 1 head

Question 10

Dicephalus

Answer 10

2 heads 1 body

Question 11

Parapagus

Answer 11

2 head 2 face 1 wide body.

Question 12

Ischiopagus

Answer 12

Joined at ischium

Question 13

Omphalopagus

Answer 13

Joined abd

Question 14

Omphaloischiopagus

Answer 14

Abd & ischia

Question 15

Pygopagus

Answer 15

Joined at butt

Question 16

Superfecundation

Answer 16

2 eggs fertilized at different times within same cycle

Question 17

Superfetation

Answer 17

2 eggs fertilized in different cycles

Question 18

Thoracopagus

Answer 18

Joined at thorax

Question 19

Thoracoomphalopagus

Answer 19

Joined thorax & abdomen

Question 20

Vanishing twin

Answer 20

An embryonic GS

Fetal demise

Question 21

Parasitic Twin / Fetus in Fetu

Answer 21

Found in Abd of sibling

Benign. Has spine parts.

Question 22

TRAP sequence / Twin Reversal Arterial Perfusion / Parabolic Twin

Answer 22

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

Question 23

Fetus Papyraceus / Paper Doll Fetus

Answer 23

Have demise, separate sac. Oligo develops and gets flattened.