Ok so this might not be for everyone and perhaps I can probably get someone to vomit on this one but this is about an extremely rare and odd surgical procedure that I heard from my friend who is currently doing residency.

He told me about this case where the doctors located, or at least thought they located, a tumor growth inside a persons brain. So they decided to cut out the tumor. And for those of you who don't know anything about brain surgery, they keep you awake and you don't feel anything.

So they did the surgery and when they removed the skull piece, they located the "tumor"...

This tumor was a very small fetus.

So my friend wouldn't tell me anything more about this since he was apparently told by the surgeon not to talk about it.

Anyone have any info on this or links to articles?

This sounds more like an urban legend than anything else. I don't even see how it's physically possible for this to happen, at all.

http://abcnews.go.com/Health/story?id=2346476&page=1
Article on something similar.

Also, the topic title is too vague for me.

Ok I did some research and I found that when the egg is fertalized, it can sometimes move outside of the area of fertilization but I didn't think it could develop all the way into the head.

To clarify, I think what my friend was saying was that it was shaped in the form a fetus but could also be a fetus?

http://news.bbc.co.uk/2/hi/health/7791321.stm

They found a baby born with a foot in it's head originally thought to be a tumor, maybe that's kinda what happened there.

You could say he was a... Cephalopod...

But that would be mean, so most people probably wouldn't.

"Looked like a fetus" is a hundred more times likely (and possible) than "was a fetus". Aside from the obvious "there's no way (passage, even) for it to get there", there's the bit about how the fetus wouldn't be able to grow to be, well, a fetus from lack of any nutrients being run into it. Heh, and hopefully someone would've caught something of that size growing in the amount of time it takes to get to there.

But good god, how would you explain to your patient that they just had a brain-abortion. "So, sir/ma'am... I understand that you've undergone a ♥♥♥♥, yes?"

That doesn't sound that far fetched. Babies can be attached at any point, and it's not unlikely for one to die and the other to live.

Sounds like it could be the plot of a House episode. I'd say about on par with the lactating breast inside the guy's knee episode.

OMG THE ALIENS PUT THE BABY IN HER HEAD OMG
You've all been playing too much XCOM.
(Or maybe I have?...)


Anyway, that sounds like a myth, not actual fact.

Some doctors at the place that I'm working at once operated on some person with a tumor that turned out to be a fetus.
...

I have no idea but I'm sticking to "looked like" theory since there is no way this could ever be "was a".