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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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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 ...
Skeletal structure of dicephalic twins. B. C. Hirst & G. A. Piersol, Human monstrosities.Wellcome L0027955. (1893) Dicephalic parapagus (/ d aɪ ˈ s ɛ f ə l ɪ k /) is a rare form of partial twinning with two heads side by side on one torso. [1]
The thorax and abdomen are separate and each twin has their own umbilicus and umbilical cord. [3] The condition is extremely rare, with an incidence of approximately 1 in 2.5 million live births. [3] An estimated 50 craniopagus twins are born around the world every year as of 2021, with only 15 twins surviving beyond the first 30 days of life. [4]
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 .