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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.
Fetus in fetu may be a parasitic twin fetus growing within its host twin. Very early in a monozygotic twin pregnancy, in which both fetuses share a common placenta, one fetus wraps around and envelops the other. 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 ...
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 ...
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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 ...
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 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: