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Neuropsychiatric symptoms (NPS) affect the quality of life of patients with dementia and increase the burden on caregivers. We aimed to evaluate how small vessel disease (SVD) such as lacunae or white matter hyperintensities (WMH), and amyloid burden affect NPS. We recruited 127 patients with subcortical vascular cognitive impairment who were assessed with brain magnetic resonance imaging, Pittsburgh compound-B (PiB) positron emission tomography and the neuropsychiatric inventory (NPI). To explore the association between lacunae, WMH, or PiB retention ratio and NPS, we performed multivariate regression analysis after controlling for possible confounders. Each additional lacuna, especially in the frontal region, was associated with higher odds of depression, apathy, aberrant motor behavior, nighttime behavior, appetite changes, and higher score of total NPI; larger WMH volume, especially in the …