Diprosopus?????

Diprosopus

Diprospus (sometimes called Craniofacial duplication) is a rare disorder in which the face is duplicated on the head (as in the picture above). This is not to be confused with fetus in fetu (item 9) which is a joining of two separate fetuses; diprosopus is caused by a protein called (believe it or not) “sonic hedgehog homolog”. The odd name is due to a controversial tradition in molecular biology to use unusual names for genes. The protein determines the makeup of the face, and when there is too much of it, you get a second face in a mirror image. If you do not have enough of the protein, you can end up with underdeveloped facial features. Children with this defect are normally stillborn, but a young girl, Lali Singh, born in 2008 survived for 2 full months before dying of a heart attack.