A cat named Frankenlouie was a famous example noted by the Guinness Book of World Records in 2012 for being the longest surviving Janus cat. Treatment
Few individuals survive until birth. For those who do, the only treatment available is to surgically remove the parasitic twin. Of the two documented attempts, however, one child died within hours and neither reached their second birthday. The problem with surgical intervention is that the arterial supplies of the head are so intertwined that it is very hard to control the bleeding, but it has been suggested that cutting off the parasitic twins arterial supply might improve the odds of the developed twins survival. Prevalence
Only ten cases of craniopagus parasiticus have been documented, out of a total of at least eighty known cases of craniopagus in general.Only four cases have been documented by modern medicine to have survived birth:

An earlier case was the so-called "Two-Headed Boy of Bengal", who was born in 1783 and died of a cobra bite in 1787. His skull remains in the collection of the Hunterian Museum of the Royal College of Surgeons of London. On December 10, 2003, Rebeca Martínez was born in the Dominican Republic with this rare condition. She was the first baby born with the condition to undergo an operation to remove the second head. She died on February 7, 2004, after an 11-hour operation. On March 30, 2004, Manar Maged was born with the rare condition. On February 19, 2005, 10-month-old Manar underwent a successful 13-hour surgery in Egypt.
See also
Pasqual Piñón, a sideshow performer billed as the Two-headed Mexican
Janus, ancient Roman god depicted with two faces
Edward Mordrake, an urban legend with a similar trait
Futakuchi-onna, Japanese yōkai with a similar trait
Tomie Kawakami, a titular character of Tomie whom possess with the two-headed appearance

References
Bibliography
External links
Image File of craniopagus parasiticus