 I've heard of this before...
It was a documentary and they happened to have mentioned how rare this is. I've never before heard of the twin growing in the sibling's head. I've seen abdomen but not within the head. I wonder if they removed all there was or would other parts of this twin develop later on in life? I guess with the rarity of the case the doctors wouldn't know would they?
__________________ Littlest JakJak 
We miss you Kaji 
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