Which condition is associated with dementia and hallucinations?

• A. Lewy body dementia (LBD)
• B. Creutzfeldt-Jakob disease (CJD)
• C. Alzheimer's disease
• D. Neurosyphilis

Answer: (D)

Lewy body dementia is characterized by dementia that prominently features visual hallucinations, often early in the course, along with fluctuations in attention and sometimes parkinsonian motor symptoms. Those vivid, well-formed visual hallucinations are a hallmark that helps distinguish this condition from other dementias.

Creutzfeldt-Jakob disease typically progresses rapidly and presents with neurologic features like myoclonus and ataxia, rather than the classic early visual hallucinations. Alzheimer's disease mainly presents with memory and learning impairments; hallucinations may occur later but are not a defining early feature. Neurosyphilis can cause cognitive decline, but hallucinations are not a central or characteristic symptom of the condition.

So the combination of dementia with early, prominent visual hallucinations points most strongly to Lewy body dementia.