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Pure psychiatric presentation of the Lewy body disease is depression—an analysis of 60 cases verified with myocardial meta‐iodobenzylguanidine study

Parkinson's disease (PD), Parkinson's disease with dementia (PDD) and dementia with Lewy bodies (DLB) were collectively termed Lewy body disease (LBD). Pure psychiatric presentation (PPP) of the LBD may be the fourth subtype in which psychiatric symptoms without definite parkinsonism and cognitive disturbance lasted for many years. The aim of this study is to localize the presence of the PPP in subjects with low uptake of myocardial meta‐iodobenzylguanidine (MIBG).