Periodic synchronous discharges (PSD) on the electroencephalogram can be observed in diseases such as Creutzfeldt-Jakob disease, hypoxic encephalopathy and Alzheimer's disease (AD). However, in previously reported cases of AD with PSD, PSD have only been found many years after the diagnosis of AD. We recently encountered a patient with mild AD accompanied by transient PSD. To our knowledge, this is the first case report to suggest that PSD can occur in mild AD.
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