Multiple Gestations Terminology Flashcards
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
Acardiac Twin
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
Amnion
Related to the number of amnions in a multiple gestation
Amnionicity
Fluid-filled space, created by the amnion, surrounding surrounding the developing embryo or fetus
Amniotic Sac
Vascular connections
Anastomoses
The condition of having a deficient number of red blood cells
Anemia
The outer membrane of a gestation that surrounds the amnion and developing embryo
Chorion
Relates to the number of chorions and the type of placentation in a multiple gestation
Chorionicity
The division of a cell
Cleavage
Monoamniotic, monochorionic twins that are attached at the head, thorax, abdomen, or lower body
Conjoined Twins
Twins joined at the cranium
Craniopagus
Having two amniotic sacs
Diamniotic
Having two placentas
Dichorionic
Having two placentas and two amniotic sacs
Dichorionic Diamniotic
Asymmetric fetal weight between twins
Discordant Fetal Growth
Two ova are fertilized by two sperms
Dizygotic
A treatment that uses lasers to separate abnormal placental vascular connections between twins that are suffering from twin-twin transfusion syndrome
Endoscopic-Guided Laser Photocoagulation
The death of one fetus in twin pregnancy that is maintained throughout the pregnancy; actually means paperlike fetus
Fetus Papyraceus
Twins that result from the fertilization of two separate ova and have dissimilar characteristics
Fraternal Twins
An abnormal accumulation of fluid at least two fetal body cavities
Hydrops (fetal)
A shortage of oxygen or decreased oxygen in the blood
Hypoxia
Twins that result from the split of a single zygote and share the same genetic structure
Identical Twins
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
Lambda Sign
Having one amniotic sac
Monoamniotic
Having one chorion
Monochorionic
Having one placenta and two amniotic sacs
Monochorionic Diamniotic
Having one placenta and one amniotic sac
Monochorionic Monoamniotic
Coming from one fertilized ovum or zygote
Monozygotic
The relative frequency of occurrence of a disease
Morbidity
The rate of actual deaths
Mortality
Conjoined twins attached at the abdomen
Omphalopagus
An unfertilized egg
Ovum
Formation or structure of a placenta, structural organization, and mode of attachment of fetal to maternal tissues during placental formation
Placentation
The development of a cystic cavity within within the cerebrum; may be the result of an intraparenchymal hemorrhage
Porencephaly
Conjoined twins joined back-to-back in the sacral region
Pyopagus
A single developing fetus
Singleton Pregnancy
Dead at birth
Stillborn
When a twin fetus, suffering from twin-twin transfusion syndrome, experiences severe oligohydroamnios and is closely adhered to the uterine wall
Stuck Twin
Type of amniocentesis used to remove a large amount of amniotic fluid around a fetus suffering from polyhydroamnios
Therapeutic Amniocentesis
Conjoined twins attached at the chest
Thoracopagus
When vascular products travel from a demised twin to the surviving twin by means of the common vascular channels within the shared placenta
Twin Embolization Syndrome
Shunting of venous or arterial blood from one twin to another through placental circulation
Twin-twin Transfusion Syndrome
The death and reabsorption of a twin
Vanishing Twin
Relates to the number of zygotes (fertilized ova)
Zygosity
The cell formed by the union of two gametes; the first stage of fertilized ovum
Zygote
