I dunno. I think I'd rather just leave them as is considering that the risks are too great (it said that the past ten surgeries killed twins of similar conditions) and I am skeptical that a parasite twin would cause that much strain on the host. I would understand if they have an extra limb or anything and I feel ok with removing them but a head that's capable of smiling and blinking eyes? I am not so sure about that. It's still a human brain even though it's a "parasite."
For me, I'd rather let them be and they should share the same death if it ever happens. The risks are too great.
I understand your feelings on this, however maybe take it from a medical view regarding the life of the other twin..? Like shel said below:
Even if the parasite deprives the host of oxygen and blood supply?
If left as is, the fully functional twin, would lose up to 1/2 or 3/4 of the blood's oxygen supply, and oxygen itself. Her body would have to work twice as harder to clean the blood of toxins, to exchange oxygen and carbon dioxide throughout the body, to get rid of any waste from both parasite twin and herself. Nutrients recieved through food, would not only go to her body but the parasite twin as well. Physically, her small body could only do so much for both of them, a wide range of medical problems could come up from her body trying to help the parasite twin live.
You know when a parasite latches onto a body, the host undergoes physical changes? Loss of weight, intestinal problems, heart problems, and so on?
That is pretty much what the parasite twin is, only if it causes physical harm to the other twin.
That is some of the things that I can offer, knowing also that there are cojoined twins with two heads and one body, alive right now.
That's kind of why I say it's immoral and moral at the same time. It all depends on the situation.
One thing I know for sure, if I ever become a parent of such, I would be struggling with decisions, while heartbroken.
