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Rapidly progressive aphasic dementia and motor neuron disease
R J Caselli1, A J Windebank, R C Petersen
1Section of Neurology, Mayo Clinic Scottsdale, AZ 85259.
Annals of Neurology
|February 1, 1993
Summary
This study identifies a distinct clinical entity characterized by rapidly progressive aphasic dementia and motor neuron disease. This condition affects speech and motor function, leading to significant cognitive decline and early mortality in affected individuals.
Area of Science:
- Neurology
- Neuroscience
- Pathology
Background:
- Motor neuron disease (MND) typically affects motor pathways.
- Aphasia and cognitive decline are not primary features of most MND presentations.
Observation:
- Seven patients (aged 54-77) presented with articulatory and language impairment preceding rapidly progressive motor neuron disease.
- All patients developed severe nonfluent aphasia; four became anarthric within a year.
- Cognitive domains were impaired, with some patients living independently until shortly before death.
Findings:
- Neuropathology revealed bilateral hemispheric atrophy, neuronal loss, and gliosis in superficial cortical layers, with relative preservation of pigmented and hypoglossal nuclei.
- Degeneration of corticospinal tracts and loss of anterior horn cells were observed at all spinal levels.
- Neuroimaging and electrophysiological studies showed widespread abnormalities.
Implications:
- This suggests a distinct clinical entity of rapidly progressive aphasic dementia and motor neuron disease.
- The nosology and underlying mechanisms of this MND subtype require further investigation.
- Early identification and understanding of this variant are crucial for patient management and research.