Cause		Frequency (%)
Alzheimer’s disease		50 to 60
Vascular disease		15 to 20
Mixed dementia		10 to 20
Other		< 10
	Diffuse Lewy-Body dementia
	Frontotemporal dementia (Pick’s disease)
	Parkinson’s disease
	Alcohol-related dementia
	Huntington’s disease
	Prion disease (Jacob-Creutzfeldt disease/slow virus)
	Trauma (subdural hematoma)
	Infections (syphilis, acquired immunodeficiency syndrome, opportunistic infections)
	Encephalitis
	Hypothyroidism
	Vitamin B12 deficiency
	Depression