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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 enveloped twin becomes a parasite, in that its survival depends on the survival of the host twin, by drawing on the host twin's blood supply. The parasitic twin is anencephalic (without a brain) and lacks some internal organs, and as such is unable to survive on its own. As the host twin has to "feed" the enveloped twin from the nutrients ...
The key difference between a parasitic twin and conjoined twins is that in parasitic twins, one twin, the parasite, stops development during gestation, whereas the other twin, the autosite, develops completely. [citation needed] In normal monozygotic twin development, one egg is fertilized by a single sperm. The egg will then completely split ...
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 ...
The phenomenon where someone carries a twin inside them is called fetus in fetu. It happens in approximately 1 in 500,000 births. You can hear more about it on the podcast below, or read on:
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 ...
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