[A remarkable case of folie à deux]

Abstract

This article reports the noteworthy case of a couple who developed three clearly separate delusions after marriage. An elaborated delusion of descent was shared by the two people, while two further delusions remained private convictions. Probable biographical connections of the shared delusions and diagnostic problems are discussed, especially the monocausal etiologic hypotheses behind the respective categories for shared psychotic disorders of ICD and DSM.