In fact the true story of Pasqual Pinon is far more disturbing. A railroad worker from Texas, Pinon was discovered by a sideshow promoter, who was fascinated by the massive tumor growing from Pinon's head. A silver plate, molded into a realistic face, was surgically inserted under the skin of Pinon's tumor, transforming the disfiguring growth into a convincing second head. Pinon was an enormous success, though his career lasted only two years. While playing in Detroit, he began to suffer from dementia, and it was found that the silver plate was compressing his brain. His manager paid for an operation to remove the enormous tumor, and Pinon returned to Texas to resume life as a laborer.
The main flaw of Pasqual Pinon's gaff was that a true parasitic head would be situated upside-down on top of the host twin's head, as a result of incomplete craniopagus twins. Only a handful of cases of craniopagus parasiticus have been recorded. Most recently, in 2005, Manar Maged of Egypt became the first baby to survive an operation to remove a parasitic head, but she died in March of 2006 of a persistent infection in her brain.
Information on Paqsual Pinon from Illustrated World, January 1922, "The 'Wonders' of the Circus World" by Frank Braden. Reproduced on Sideshow World as "The Volpus and the Two-Headed Man", May 2005.