[The delusion of lycanthropic transformation].

The authors describe one case of Lycanthropy and revise the literature about this theme. They observe that Lycanthropy has received scant attention in the modern literature, but appears to have survived into modern times. In some cases the patient (as a Delusion) has the belief that he has been transformed into an animal. In other cases there appears only what seems to be behaviour of an animal. About the first group, the authors make a phenomenological analysis and present a clinical case of Lycanthropic delusion.