In extremely rare cases, doctors remove the fetus from the brain of a 1-year-old

In an extremely rare case, doctors surgically removed a fetus from the brain of a 1-year-old child. Doctors found the fetus after the child showed delayed development of motor skills, an increased head circumference and a buildup of fluid in the brain.

The report was published in the journal on December 12, 2022 neurology (opens in new tab), noted that the mass in the young child’s head was a “malformed monochorionic diamniotic twin,” meaning that the fetuses in the womb had once shared the same placenta but had separate amniotic sacs, the thin-walled, fluid-filled sacs that make up the fetuses surround as they develop. These types of twins come from the same fertilized egg, meaning they are identical.

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