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Monoamniotic twins. Monoamniotic twins are identical or semi-identical twins that share the same amniotic sac within their mother's uterus. [ 1] Monoamniotic twins are always monochorionic and are usually termed Monoamniotic-Monochorionic ("MoMo" or "Mono Mono") twins. [ 1][ 2] They share the placenta, but have two separate umbilical cords.
Specialty. Obstetrics and gynaecology. A vanishing twin, also known as twin resorption, is a fetus in a multigestation pregnancy that dies in utero and is then partially or completely reabsorbed. [ 1][ 2] In some instances, the dead twin is compressed into a flattened, parchment-like state known as fetus papyraceus. [ 3]
Fetus in fetu (or foetus in foetu) is a rare developmental abnormality in which a mass of tissue resembling a fetus forms inside the body of its twin. An early example of the phenomenon was described in 1808 by George William Young. [ 1] There are two hypotheses for the origin of a "fetus in fetu". One hypothesis is that the mass begins as a ...
Monochorionic twins are monozygotic (identical) twins that share the same placenta. If the placenta is shared by more than two twins (see multiple birth ), these are monochorionic multiples. Monochorionic twins occur in 0.3% of all pregnancies. [ 1] Seventy-five percent of monozygotic twin pregnancies are monochorionic; the remaining 25% are ...
Breech birth. A breech birth is when a baby is born bottom first instead of head first, as is normal. [1] Around 3–5% of pregnant women at term (37–40 weeks pregnant) have a breech baby. [2] Due to their higher than average rate of possible complications for the baby, breech births are generally considered higher risk. [3]
Pregnancy is the time during which one or more offspring develops inside a woman's uterus (womb). [4] [13] A multiple pregnancy involves more than one offspring, such as with twins. [14] Pregnancy usually occurs by sexual intercourse, but can also occur through assisted reproductive technology procedures. [6]
The twin reversed arterial perfusion, or T.R.A.P. sequence, results in an 'acardiac twin', a parasitic twin that fails to develop a head, arms and a heart.The parasitic twin, little more than a torso with or without legs, receives its blood supply from the host twin by means of an umbilical cord-like structure, much like a fetus in fetu, except the acardiac twin is outside the autosite's body.
Three months before that, at 17 weeks of pregnancy, she and her husband, Matthew Dell, had gotten an ultrasound to learn the gender of what they thought was one baby.
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