UN CAS DE FOLIE À TROIS

THIS ARTICLE, DESCRIBING A RARE CLINICAL CASE, DISPLAYS THE BIRTH AND DEVELOPMENT OF AN IDENTICAL DELUSION IN A PARTICULAR TYPE OF RELATIONSHIP: TWIN SISTERS AND THEIR MOTHER. THE REVIEW OF THE LITERATURE HAD TO BE LIMITED TO CERTAIN ASPECTS OF THE SUBJECT, WHICH HAS BEEN EXTENSIVELY DESCRIBED. IT DEVELOPS THE HISTORICITY OF THE CONCEPT OF "FOLIE A DEUX", THE EPIDEMIOLOGY, THE ETIOLOGICAL HYPOTHESIS AND TREATMENT OF THE DISORDER. IN ADDITION, THE RESPECTIVE DIAGNOSIS OF EACH PARTNER INVOLVED IN THE SHARED DELUSION IS DISCUSSED; A SUBJECT WHICH IS FURTHERMORE VERY CONTROVERSIAL AND WHICH QUESTIONS THE DEFINITION OF THE DIAGNOSIS "FOLIE A DEUX" ITSELF.