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[Progressive aphasia. New data on an old phenomenon].
Per Ostberg1, Christian Andersen, Lars-Olof Wahlund
1Geriatriska kliniken, Huddinge Universitetssjukhus, Stockholm.
Lakartidningen
|June 5, 2002
Summary
Progressive aphasias, like semantic dementia and progressive nonfluent aphasia, are specific forms of non-Alzheimer lobar atrophy. These conditions involve distinct brain atrophy patterns causing language and conceptual deficits.
Area of Science:
- Neurology
- Neuroscience
- Linguistics
Background:
- Progressive aphasias are underrecognized clinical manifestations of lobar atrophy.
- These disorders are distinct from Alzheimer's disease but share underlying pathology.
- Semantic dementia and progressive nonfluent aphasia represent key examples.
Observation:
- Semantic dementia (SD) is characterized by bilateral infratemporal atrophy, leading to a loss of conceptual knowledge.
- Progressive nonfluent aphasia (PA) results from left perisylvian atrophy, causing phonetic and syntactic impairments.
Findings:
- SD and PA represent distinct clinical entities within the spectrum of non-Alzheimer lobar atrophy.
- Historical research on Pick disease identified left temporal lobe atrophy and aphasia, linking it to these progressive conditions.
Implications:
- The label 'Pick disease' or 'Pick complex' remains a useful classification for progressive aphasias and related lobar atrophies.
- Recognizing these specific syndromes aids in differentiating them from Alzheimer's disease and other dementias.