I had a buddy of mine from High School go through a horrific experience with this.
He and his wife had been trying to have a child for a long time. Finally, they conceived one. She got along about 4 months, and went in for an ultrasound checkup.
Due to something( They never told me what, and I never asked) There was a problem in the womb. Seems that the Child was developing some of it's internal organs outside of the skin.Apperantly the major ones, such as the heart and lungs.
However, the fetus was still alive.
No doctor they saw said that if Birth was succesful(It would be a surgical Procedure even more invasive than a C-section), could they give even less than a 1% chance for survival. They decided to abort.
Now in this, It should be said, they kept trying, and did eventually have a normal, healthy child. But to this day, my buddy and the doctor agreed, to never let his wife see just how scary looking the ultrasound images were.
The doctor said it would have scared her out of trying to have another child. As it was, they had to go to counseling over the abortion part.