Parkinson's disease with late Pick's dementia

Area of Science:

• Neurology
• Neuroscience
• Pathology

Background:

• Idiopathic Parkinson's disease (IPD) typically presents with motor symptoms like tremor and rigidity.
• The cause of dementia in IPD is debated, with various neuropathological findings reported.
• Frontotemporal dementia with parkinsonism linked to chromosome 17 (FTDP-17) involves genetic factors and parkinsonism.

Observation:

• A patient exhibited IPD symptoms for seven years, responsive to levodopa, before developing significant behavioral and cognitive decline.
• Neuropsychological evaluations showed no dementia until late in the disease progression.
• The patient required full care and died 16 years after symptom onset.

Findings:

• Post-mortem analysis revealed co-existing Lewy body Parkinson's disease and Pick's disease.
• This is the first reported non-familial case with this specific combination of clinical history and pathological confirmation.
• The late onset of dementia and absence of family history distinguish this case from genetic FTDP-17.

Implications:

• This case demonstrates that Pick's disease can be a cause of dementia in patients with a clinical diagnosis of idiopathic Parkinson's disease.
• It underscores the importance of comprehensive neuropathological examination for accurate diagnosis in complex neurodegenerative cases.
• The findings contribute to understanding the diverse etiologies of dementia in the context of Parkinson's disease.