Conjoined twins are identical twins who are joined together somewhere in the body, most often at the chest, abdomen or pelvis. They are monozygotic twins, in the sense that they share the same zygote.
The formation of this twin type is believed to be the result of late twinning. When the twinning occurs more than 12-13 days after fertilization of the egg, it may lead to the formation of conjoined twins because the embryo may not split completely.
Conjoined twin births are very rare, amounting to around one birth in every 100,000 births. The ratio of female and male sets was found to be three to one. There is a slightly higher chance of conjoined twins from Africa and Southwest Asia.
Depending on where they are joined, some may share some vital internal organs.
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