Quote Originally Posted by sycld View Post
Kind of...

http://en.wikipedia.org/wiki/Fetus_in_fetu

As they also explained in the article, occurrences of fetus in fetu like this could either be parasitic twins or teratomas, a type of tumor that sometimes has a high degree of differentiation and can develop into limbs or torsos in inappropriate places...
At least I was sort of right. Not bad for not googling.