The etiology of Folie à Deux remains a controversial topic; the relationship between the psychopathology exhibited by the dominant partner and that shown by the submissive one being particularly unclear.
Modern etiological theories attempt to reduce the phenomena of Folie à Deux to a procrustean mould, emphasizing in particular the contribution of schizophrenic pathology to the development of the condition. A case is described which raises doubts about the general applicability of this approach.
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