Lycanthropy is the belief in the capacity of human metamorphosis into animal form. It has been recorded in many cultures. Apart from historic description of lycanthropy, there has been several case reports described in the medical literature over the past 30 years. METHOD: We identified eight cases of lycanthropy in 20 years, mainly in the area of Babylon, Iraq. RESULTS: The most commonly reported diagnosis was severe depressive disorder with psychotic symptoms. The type of animal that the patients changed into were mainly dogs (seven cases) and only one case changed into a cow for the first time to report. CONCLUSION: Lycanthropy delusion is a rare delusion but appears to have survived into modern times with possible archetypal existence.
Related, and image from wiki:
Werewolves, also known as lycanthropes from the Greek Î»Ï…ÎºÎ¬Î½Î¸ÏÏ‰Ï€Î¿Ï‚, Î»ÏÎºÎ¿Ï‚ (wolf) and Î¬Î½Î¸ÏÏ‰Ï€Î¿Ï‚ (human, man), are mythological or folkloric humans with the ability to shapeshift into wolves or anthropomorphic wolf-like creatures, either purposely, by being bitten by another werewolf, or after being placed under a curse. This transformation is often associated with the appearance of the full moon, as popularly noted by the medieval chronicler Gervase of Tilbury, although it may have been recognized in earlier times among the ancient Greeks through the writings of Petronius. Werewolves are often granted extra-human strength and senses, far beyond those of both wolves or men. The werewolf is generally held as a European character, although its lore spread through the world in later times. Shape-shifters, similar to werewolves, are common in tales from all over the world, most notably amongst the American Indians, though most of them involve animal forms other than wolves.