Diprosopus
Diprosopus (Greek: διπρόσωπος, "two-faced", from δι-, di-, "two" and πρόσωπον, prósopon [neuter], "face", "person"; with Latin ending), also known as craniofacial duplication (cranio- from Greek κρανίον, "skull", the other parts Latin), is an extremely rare congenital disorder whereby parts (accessories) or all of the face are duplicated on the head. == Development == Although classically considered conjoined twinning (which it resembles), diprosopus is not normally due to the fusion or incomplete separation of two embryos.