Which is the second most common dementia?

• A. Alzheimer's disease
• B. Lewy Bodies
• C. Pick's disease
• D. Frontotemporal dementia

Answer: (B)

Alzheimer’s disease is the most common dementia, so the second place in frequency goes to Lewy body dementia. This form is relatively common among neurodegenerative causes of dementia and is defined by Lewy bodies in cortical and subcortical areas, which produce cognitive fluctuations, visual hallucinations, parkinsonian signs, and REM sleep behavior disorder. The other options—frontotemporal dementia and Pick’s disease—are less common, especially in the typical older-dementia population, making them unlikely to be more frequent than Lewy body dementia. So the second most common dementia, in many epidemiological reports, is Lewy body dementia.