[Folie à deux, symptoms sharing us a relationship modality: a case report].

Shared Psychotic Disorder or Folie à deux is a rare and controversial entity that raises phenomenological, nosographic and psychopathological issues. It questions the nature of dilusion and its occurrence outside the psychotic structure and also the issue of symptoms contagion in psychiatry. We offer a semiological analysis of an intrafamilial case of Folie à deux, a case with the clinical specificity of sharing not only delusional symptoms but also non-delusional psychotic elements.

[Nosographic considerations on delusional parasitosis based on three clinical observations].

Ekbom syndrome or delusional parasitosis is a rare disease characterized by the unwavering conviction of having cutaneous infestation of insects or parasites. This is a monothematic delusion of hallucinatory origin that typically affects older women. We report the case of three patients with delusional parasitosis in different clinical settings.