Multiple Gestations Terminology

Question 1

An abnormally developed twin that has as absent upper body and no heart; also referred to as parasitic twin; also referred to as twin-reversed arterial perfusion sequence

Answer 1

Acardiac Twin

Question 2

The inner sac that contains the embryo and amniotic fluid; echogenic curvilinear structure that may be seen during the first trimester within the gestational sac

Answer 2

Amnion

Question 3

Related to the number of amnions in a multiple gestation

Answer 3

Amnionicity

Question 4

Fluid-filled space, created by the amnion, surrounding surrounding the developing embryo or fetus

Answer 4

Amniotic Sac

Question 5

Vascular connections

Answer 5

Anastomoses

Question 6

The condition of having a deficient number of red blood cells

Answer 6

Anemia

Question 7

The outer membrane of a gestation that surrounds the amnion and developing embryo

Answer 7

Chorion

Question 8

Relates to the number of chorions and the type of placentation in a multiple gestation

Answer 8

Chorionicity

Question 9

The division of a cell

Answer 9

Cleavage

Question 10

Monoamniotic, monochorionic twins that are attached at the head, thorax, abdomen, or lower body

Answer 10

Conjoined Twins

Question 11

Twins joined at the cranium

Answer 11

Craniopagus

Question 12

Having two amniotic sacs

Answer 12

Diamniotic

Question 13

Having two placentas

Answer 13

Dichorionic

Question 14

Having two placentas and two amniotic sacs

Answer 14

Dichorionic Diamniotic

Question 15

Asymmetric fetal weight between twins

Answer 15

Discordant Fetal Growth

Question 16

Two ova are fertilized by two sperms

Answer 16

Dizygotic

Question 17

A treatment that uses lasers to separate abnormal placental vascular connections between twins that are suffering from twin-twin transfusion syndrome

Answer 17

Endoscopic-Guided Laser Photocoagulation

Question 18

The death of one fetus in twin pregnancy that is maintained throughout the pregnancy; actually means paperlike fetus

Answer 18

Fetus Papyraceus

Question 19

Twins that result from the fertilization of two separate ova and have dissimilar characteristics

Answer 19

Fraternal Twins

Question 20

An abnormal accumulation of fluid at least two fetal body cavities

Answer 20

Hydrops (fetal)

Question 21

A shortage of oxygen or decreased oxygen in the blood

Answer 21

Hypoxia

Question 22

Twins that result from the split of a single zygote and share the same genetic structure

Answer 22

Identical Twins

Question 23

A triangular extension of the placenta at the base of the membrane is indicative of a dichorionic diamniotic pregnancy; also referred to as the delta sign or the twin peak sign

Answer 23

Lambda Sign

Question 24

Having one amniotic sac

Answer 24

Monoamniotic

Question 25

Having one chorion

Answer 25

Monochorionic

Question 26

Having one placenta and two amniotic sacs

Answer 26

Monochorionic Diamniotic

Question 27

Having one placenta and one amniotic sac

Answer 27

Monochorionic Monoamniotic

Question 28

Coming from one fertilized ovum or zygote

Answer 28

Monozygotic

Question 29

The relative frequency of occurrence of a disease

Answer 29

Morbidity

Question 30

The rate of actual deaths

Answer 30

Mortality

Question 31

Conjoined twins attached at the abdomen

Answer 31

Omphalopagus

Question 32

An unfertilized egg

Answer 32

Ovum

Question 33

Formation or structure of a placenta, structural organization, and mode of attachment of fetal to maternal tissues during placental formation

Answer 33

Placentation

Question 34

The development of a cystic cavity within within the cerebrum; may be the result of an intraparenchymal hemorrhage

Answer 34

Porencephaly

Question 35

Conjoined twins joined back-to-back in the sacral region

Answer 35

Pyopagus

Question 36

A single developing fetus

Answer 36

Singleton Pregnancy

Question 37

Dead at birth

Answer 37

Stillborn

Question 38

When a twin fetus, suffering from twin-twin transfusion syndrome, experiences severe oligohydroamnios and is closely adhered to the uterine wall

Answer 38

Stuck Twin

Question 39

Type of amniocentesis used to remove a large amount of amniotic fluid around a fetus suffering from polyhydroamnios

Answer 39

Therapeutic Amniocentesis

Question 40

Conjoined twins attached at the chest

Answer 40

Thoracopagus

Question 41

When vascular products travel from a demised twin to the surviving twin by means of the common vascular channels within the shared placenta

Answer 41

Twin Embolization Syndrome

Question 42

Shunting of venous or arterial blood from one twin to another through placental circulation

Answer 42

Twin-twin Transfusion Syndrome

Question 43

The death and reabsorption of a twin

Answer 43

Vanishing Twin

Question 44

Relates to the number of zygotes (fertilized ova)

Answer 44

Zygosity

Question 45

The cell formed by the union of two gametes; the first stage of fertilized ovum

Answer 45

Zygote