Schizophrenia Phenotype Preceding Behavioral Variant Frontotemporal Dementia Related to C9orf72 Repeat Expansion

Behavioral variant frontotemporal dementia (bvFTD) shares a constellation of clinical features with primary psychiatric disorders. The discovery of new FTD-related genetic mutations has brought attention to this overlap between bvFTD and psychotic disorders. The case reported here raises the question of whether C9orf72 repeat expansion may be involved in neuropsychiatric syndromes beyond the spectrum of neurodegenerative disease. A 61-year-old woman was referred to our memory clinic for behavioral changes and progressive cognitive decline over the last 3 years. Her medical history was significant for schizophrenia since age 36, with an exacerbation of psychotic symptoms at age 55, at which time she slowly worsened, became disorganized and apathetic, and presented new perseverative behaviors. Brain MRI showed mild bilateral frontal and temporal cortical atrophy, and 18F-fluorodeoxyglucose PET showed bilateral frontal and anterior temporal hypometabolism. Genetic analysis revealed C9orf72 hexanucleotide repeat expansion with more than 80 G4C2 repeats. Recently, FTD due to C9orf72 repeat expansion has been reported to show a high frequency of psychotic presentations. C9orf72 repeat expansion has previously been identified as a rare but possible cause of schizophrenia spectrum disorders. Our case report is characterized by a C9orf72-associated schizophrenia phenotype preceding bvFTD by 2 decades, which might reflect early prodromal neurodegeneration or neurodevelopmental and neur...

Source: Cognitive and Behavioral Neurology - June 1, 2019 Category: Neurology Tags: Case Reports Source Type: research