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In 2015, a young woman began to have headaches. They discovered that she had a brain tumor, and when the doctors removed it, they were shocked to see that it was a lump resembling skin that contained bone, teeth, and hair. There was even one growing inside of a man’s stomach. It weighed a whopping 14 pounds and resembled a lump of flesh with teeth and hair that had grown 2-3 feet long. The explanation for these occurrences is parasitic twins: a process where two fertilized embryos begin development in the uterus, but one embryo develops faster, at the expense of the other. The slower embryo ceases development and is sometimes partially or even completely consumed by its twin. The cells then become dependent on the bodily function of the complete fetus.

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