Which term describes dementia in Parkinson disease that resembles Lewy body dementia and tends to occur later?

Which term describes dementia in Parkinson disease that resembles Lewy body dementia and tends to occur later?

• A. Parkinson disease dementia early
• B. Parkinson disease dementia later
• C. Parkinson disease dementia timing
• D. Dementia

Answer: (B)

Timing of cognitive symptoms relative to motor symptoms is what distinguishes this pattern. When dementia develops later in the course of Parkinson disease—after motor symptoms have already begun—the presentation fits Parkinson disease dementia (PDD). The exam wording uses a form that literally means “Parkinson disease dementia later,” signaling that dementia appears after the parkinsonian features have been established, often following the typical progression and Lewy body-related pathology. In contrast, dementia that starts around the time motor symptoms begin points to dementia with Lewy bodies rather than a later Parkinson disease dementia. The other options don’t convey this late-onset, PD-specific timing as clearly.

Timing of cognitive symptoms relative to motor symptoms is what distinguishes this pattern. When dementia develops later in the course of Parkinson disease—after motor symptoms have already begun—the presentation fits Parkinson disease dementia (PDD). The exam wording uses a form that literally means “Parkinson disease dementia later,” signaling that dementia appears after the parkinsonian features have been established, often following the typical progression and Lewy body-related pathology. In contrast, dementia that starts around the time motor symptoms begin points to dementia with Lewy bodies rather than a later Parkinson disease dementia. The other options don’t convey this late-onset, PD-specific timing as clearly.