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Doctor insights on: Conjoined Hensel Twins

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Why are conjoined twins formed?

Why are conjoined twins formed?

Early accidental dev: Conjoined twins result from incomplete division of two embryonic discs at very early postconceptional age. They are an accident in early human development and exceedingly rare. ...Read more

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If twins are monozygotic but dichorionic are they less completely identical genetically than monochorionic twins ?

If twins are monozygotic but dichorionic are they less completely identical genetically than monochorionic twins ?

The same.: Monozygotic dichorionic is another term for monochorionic diamniotic twins. They are expected to be genetically identical in both cases because they come from one original fertilized egg. ...Read more

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Does identical twins have different sacs?

Does identical twins have different sacs?

Some do some don't: If two twins share the same sac, they're identical. (almost always works.) the pathologist who examines the placenta can tell. Identical twins can have two sacs, or one sac; if there are two sacs, there can be one or two chorions. Fraternal twins won't share chorions or sacs. ...Read more

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Does children of identical twins who marry identical twins look alike?

Does children of identical twins who marry identical twins look alike?

Not always: They would be no more likely to look alike than any other siblings. ...Read more

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Are there any conjoined twins with heart defects that survive?

Are there any conjoined twins with heart defects that survive?

Case reports only.: Most such cases die. The exceptions serve to illustrate this rule and are few and far between. ...Read more

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If chances of conception increase in 2 embryo transfer IVF Why doc recomend single embryo?what are risks of 2 embryo apart from twins?

If chances of conception increase in 2 embryo transfer IVF Why doc recomend  single  embryo?what are risks of 2 embryo apart from twins?

It's all about twins: Twins are a little bit trickier pregnancy. Twinning with 2 embryos is as high as 20-30%. In the US the ASRM allows 1 or 2 embryos in a 29 year old woman, but recommends only one. Personally I believe this is patient's choice and do NOT recommend 1 vs. 2, but that's me. Your info says you are 29 and in the UK? I do not know the UK standard of care but the science is the same. Best wishes! ...Read more

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Heterochromia in one identical twin, not the other. Are they fraternal?

Heterochromia in one identical twin, not the other. Are they fraternal?

Not necessarily.: Identical vs. Fraternal twins are archaic terms that no longer apply to the modern perinatal terminology., however are still generally true and understandable to lay people. The color of eyes is not the determining factor in zygocity or chorionicity of twins - check prenatal records and placental pathology! ...Read more

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Does monochorionic diamniotic twin pregnancy mean that my babies are identical?

Does monochorionic diamniotic twin pregnancy mean that my babies are identical?

Yes: While the diagnosis may be suspected, it can only be confirmed by close examination of the placentas or genetic testing before/after delivery. Usually with early ultrasounds, we can be pretty sure about identical or monozygotic twins. It means that during very early embryo development, one embryo split into two. ...Read more

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Do identical twins have the exact same DNA?

Do identical twins have the exact same DNA?

Yes: Identical twins start off with the exact same DNA. Small mutations can occur, so there might be slight differences that develop. ...Read more

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Are fraternal or identical twins more common?

Are fraternal or identical twins more common?

Yes: Fraternal twins are 3 times as frequent as identical. Fraternal twins happen when there is double ovulation and 2 eggs get fertilized. They are the type of twins that run in families. Identical twins come from 1 fertilized egg which separate in early gestation. Depending on when they separate, the babies can be in 2 distinct sac (di/di), 2 sacs within a shared sac (mono/di) or 1 sac (mono/mono). ...Read more

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Will every triplet or twin in identical births have the same learning disability?

Will every triplet or twin in identical births have the same learning disability?

No: Identical twins share some disorders to a high degree (e.g., adhd, bipolar disorder), but learning disabilities are not a specific disorder, rather a heterogenous grouping of brain dysfunctions that may affect learning. Multiples are at higher risk for ld's because of shortened gestation, increased incidence of neonatal problems, & decreased intrauterine nutrition. ...Read more

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Are conjoined twins attached at the head considered one person?

Are conjoined twins attached at the head considered one person?

Good one - no.: Although your question has metaphysical attributes, i would say that clearly cephalopagus conjoined twins are two genetically identical individuals fused at the head, but having separate brain anatomy and psyche. ...Read more

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Eggs splice, or the two fraternal twins suffer from vanishing twin syndrome and the twin literally absorbs the other twin, what does this mean?

Eggs splice, or the two fraternal twins suffer from vanishing twin syndrome and the twin literally absorbs the other twin, what does this mean?

Conjoined placenta: Unfortunately, the placenta often becomes shared between the twins and the one with the better access to the cotyledons of the placenta thrives and the other twin does not. An alternate scenario is when the two fraternal fetal twins are joined together but one does not develop as well as the other prior to placental development in the first trimester. ...Read more

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Will every triplet or twin in identical births have the same developmental disability?

Will every triplet or twin in identical births have the same developmental disability?

Probably not: Developmental delay/disabilities have many causes, most of which are not genetic. If you are known to carry a genetic disease associated with developmental disability, testing can usually be performed on each fetus individually while still in the uterus. If you are thought to have identical (monozygotic) twins or triplets, then they would all share identical genes. ...Read more

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Do identical twins both develop autosomal dominant disorders?

Do identical twins both develop autosomal dominant disorders?

Yes: They occur when one fertilized egg & sperm split in to two pregnancies, so will share all features, good and bad. ...Read more

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Are identical twins always identical?

Twins: Not necessarily. Personality-wise, there is a pair of identical twins in my practice who have different personalities. One is an extrovert and athletic in nature while the other is introverted. ...Read more