Uh, right, question. I was looking over a fanfic I wrote a little while back where one of the characters contracted a disease that didn't do wonders for oxygen transport through the body. It got to the point where her body tried to abort her unborn children (read: cargo unnecessary for personal survival). Note that I said children - she was carrying twins.
To cut a long story short, here's the question: Suppose this happened in real life. Missing Twin Syndrome aside, what is the likelihood of only one twin being aborted late in pregnancy, say six months? If we're talking about identical twins, could the other be saved once the process began? Fraternal?