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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.
The exact development of craniopagus parasiticus is not well known. However, it is known that the underdeveloped twin is a parasitic twin. Parasitic twins are known to occur in utero when monozygotic twins start to develop as an embryo, but the embryo fails to completely split. When this happens, one embryo will dominate development, while the ...
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.
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Luckily, the latest FIF case had a much happier outcome: a 3D/4D ultrasound helped diagnose the condition at 35 weeks, leading doctors to perform a C-section lest the abdominal mass crush the ...
When 45-year-old Jenny Kavanagh visited doctors to have a contraceptive coil implanted, doctors discovered an undeveloped unborn twin growing inside her. The twin was discovered when medics ...
A vestigial twin is a form of parasitic twinning, where the parasitic "twin" is so malformed and incomplete that it typically consists entirely of extra limbs or organs. It also can be a complete living being trapped inside the host person, however the parasitic twin is anencephalic and lacks consciousness .
The doctors were able to successfully remove the 12-by-6-by-4-inch mass — the largest FIF ever removed — from the girl's body. "I was much worried about my abdominal lump," she said in the BMJ ...