['Home away from house': an example of a reduplicative paramnesia].

We describe a 78-year old male patient with Parkinson’s disease and without a past psychiatric history, who had hallucinations and a very particular form of a delusional misidentification syndrome. His belief that he was not at home and that his home was on a different location, even in another country, is a form of 'reduplicative paramnesia'. This delusion is seen more often in association with neurodegenerative disease, for example in Parkinson’s disease. We describe the characteristics of this delusion, provide possible explanations and delineate several therapeutic options.