Classic amyotrophic lateral sclerosis with dementia

Area of Science:

• Neurology
• Neuroscience
• Pathology

Background:

• Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease affecting nerve cells in the brain and spinal cord.
• Severe dementia, particularly of the Alzheimer's type, is a cognitive impairment characterized by significant memory loss and decline in other cognitive functions.
• The co-occurrence of ALS and severe dementia is rare, with most documented cases originating from isolated Western Pacific populations.

Observation:

• This report details three female patients presenting with clinically and neuropathologically confirmed ALS and severe dementia.
• In all three cases, the primary manifestation of ALS involved bulbar symptoms.
• Dementia preceded the onset of ALS symptoms in two of the patients.

Findings:

• Autopsy revealed a significant disparity between the severe Alzheimer's-type dementia and the non-specific neuropathologic findings, which lacked definitive Alzheimer's changes.
• The clinical presentation and progression in these cases closely mirror recently reported Japanese cohorts.
• The combination of sporadic ALS and progressive dementia appears to be a distinct clinical entity.

Implications:

• The findings indicate that the ALS-dementia syndrome is not confined to isolated populations and also occurs in Western countries.
• The lack of consistent neuropathologic changes suggests that current diagnostic markers may not fully capture the underlying pathology of this combined condition.
• Further research is warranted to elucidate the etiology and specific neuropathologic underpinnings of this clinical entity.