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Delusions, hallucinations, and other psychotic symptoms in late life may be more common than previously thought. A Swedish investigation (Ostling et al. 2007) found that the prevalence of any psychotic symptom in a population-based sample of 95-year-old individuals who did not have dementia was 7.1%, with 6.7% experiencing hallucinations, 10.4% having delusions, and 0.6% experiencing paranoid ideation. In this chapter, we review the epidemiology, presentation, diagnosis, and treatment of chronic late-life psychotic disorders not secondary to a mood disorder or a general medical condition other than dementia. Thus, we discuss early-onset schizophrenia, late-onset schizophrenia, and very-late-onset schizophrenia-like psychosis (VLOSLP) (i.e., onset after age 60); delusional disorder; psychosis of Alzheimer’s disease (AD); and psychosis associated with other dementias.
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