In the Medieval times, barbers-surgeons roamed the countryside offering a surgery for removing the "stone of madness"
or  "pierre de follie", which supposedly existed inside the skulls of mentally deranged people.
 

Scala / Art Resource: Removal of the Stone of Folly Hieronymus Bosh, Prado, Madri

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Uma realização: Núcleo de Informática Biomédica