In "vanishing twin" syndrome, when the fetal tissue is absorbed by the other twin (or placenta or the mother), what exactly takes place? How exactly is the other twin absorbed?

Dear Curious

Here is a medical explanation:

http://www.americanpregnancy.org/multiples/vanishingtwin.html

"The cause of vanishing twin syndrome is frequently unknown. Abnormalities that result in the vanishing twin appear to be present from early in development rather than from a sudden occurrence. Analysis of the placenta and/or fetal tissue frequently reveals chromosomal abnormalities, while the surviving twin is usually normal. Improper cord implantation may also be a cause."

Judie Brown

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