Related Experiment Videos
Resolving metabolic abnormalities in a case of pure alexia
F L Silver1, J B Chawluk, T M Bosley
1Department of Neurology, University of Pennsylvania, Philadelphia 19104.
Neurology
|May 1, 1988
Summary
This study shows resolving metabolic abnormalities in a pure alexia patient, linking brain disconnection to reading impairment. Positron emission tomography revealed improved glucose metabolism after infarction.
Area of Science:
- Neuroscience
- Neurology
- Radiology
Background:
- Pure alexia, a reading disorder, can result from acute cerebral infarction.
- Assessing cerebral glucose metabolism aids in understanding neurological deficits.
Observation:
- A patient with pure alexia secondary to left-hemispheric infarction showed clinical improvement.
- Positron emission tomography (PET) with 18F-fluorodeoxyglucose (18F-FDG) measured local cerebral glucose metabolism (lCMRgl).
- Imaging revealed small, stable lesions in the lateral geniculate body and splenium of the corpus callosum.
Findings:
- PET scans demonstrated evolving metabolic abnormalities corresponding to clinical recovery.
- These abnormalities indicated intrahemispheric and interhemispheric disconnection, not occipital lobe infarction.
- Focal hypometabolism occurred without infarction, suggesting disconnection as a cause of pure alexia.
Implications:
- Cerebral disconnection can manifest as pure alexia, even without direct cortical infarction.
- This case highlights the utility of PET in tracking metabolic changes and recovery in stroke patients.
- Understanding disconnection syndromes is crucial for diagnosing and managing reading impairments after brain injury.