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Primary amnesia of insidious onset with subsequent stabilisation
F Lucchelli1, E De Renzi, D Perani
1Neurology Department, Ospedale S Carlo Borromeo, Milan, Italy.
Journal of Neurology, Neurosurgery, and Psychiatry
|November 1, 1994
Summary
This study presents a rare case of isolated amnesia, a memory disorder. Positron emission tomography (PET) revealed reduced brain metabolism in specific regions, highlighting a potential cause for this cognitive deficit.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Monosymptomatic cognitive disorders are increasingly recognized.
- Previous cases have focused on language, praxis, and visual recognition deficits.
- Amnesia as an isolated cognitive deficit requires further investigation.
Observation:
- A patient presented with a slowly progressive amnesic syndrome over 2.5 years.
- Preserved intellectual skills, language, perception, praxis, and calculation were noted.
- Memory impairment was specific to verbal and visual learning, with spared spatial learning and retrograde memory.
Findings:
- Magnetic resonance imaging (MRI) was unremarkable.
- Positron emission tomography (PET) indicated hypometabolism in the left temporal mesial region and thalamus.
- This pattern suggests a localized metabolic dysfunction underlying the amnesia.
Implications:
- This case expands the spectrum of monosymptomatic cognitive disorders to include amnesia.
- It underscores the utility of advanced neuroimaging like PET in diagnosing subtle cognitive impairments.
- Further research into localized brain metabolism and memory is warranted.
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