[Shared psychotic disorder (Folie à deux) and Huntington's disease]

Area of Science:

• Psychiatry
• Neurology
• Genetics

Background:

• Folie à deux is a rare psychiatric disorder characterized by the adoption of delusions by one individual from another, typically in close relationships.
• It most commonly arises from paranoid schizophrenia.

Observation:

• This report describes the first documented case of a married couple experiencing shared psychotic disorders.
• The husband had a genetically confirmed diagnosis of Chorea Huntington, which was the underlying cause of the psychosis.

Findings:

• The wife's psychotic symptoms significantly improved upon spatial separation from her husband.
• This suggests her condition was a form of Folie imposée, a subtype of Folie à deux.

Implications:

• This case highlights that organic psychoses, such as those associated with Chorea Huntington, can induce shared psychotic disorders.
• It expands the known etiology of Folie à deux beyond schizophrenia.