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Leukoencephalopathy in diffuse hemorrhagic cerebral amyloid angiopathy
Abstract:
We have studied 12 patients with diffuse hemorrhagic cerebral amyloid angiopathy clinically and at postmortem examination. The brains in 8 patients had diffuse bilateral loss of myelin in the hemispheric white matter sparing the U fibers, corpus callosum, and internal capsules. The periventricular areas were predominantly affected. Microscopic examination of the white matter showed an association with subacute or chronic edematous lesions: spongiosis, swollen oligodendroglia, widening of the perivascular spaces with edema fluid or siderophages, hyalinization of the blood vessel walls, incomplete myelin loss, and astrocytic gliosis. Three of 8 autopsied patients had undergone computed tomographic examination, which showed bilateral hypodensity of the hemispheric white matter. The brains of 4 patients with illnesses of shorter duration showed only discrete but similar lesions in the centrum semiovale. These white matter changes are similar to those observed in Binswanger's subcortical encephalopathy. We suggest that a common mechanism of hypoperfusion of the distal white matter causes the leukoencephalopathy.
Insights
Diffuse hemorrhagic cerebral amyloid angiopathy is linked to white matter loss, particularly in periventricular areas. This leukoencephalopathy may stem from a common hypoperfusion mechanism affecting distal white matter.
Area of Science:
- Neuropathology
- Neuroimaging
- Vascular Neurology
Background:
- Cerebral amyloid angiopathy (CAA) is a significant cause of spontaneous lobar hemorrhage.
- Diffuse white matter changes are increasingly recognized in neurological disorders.
- Understanding the neuropathological correlates of CAA is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate the white matter changes in patients with diffuse hemorrhagic cerebral amyloid angiopathy.
- To compare postmortem findings with antemortem neuroimaging.
- To explore potential underlying mechanisms for observed leukoencephalopathy.
Main Methods:
- Postmortem examination of 12 patients with diffuse hemorrhagic cerebral amyloid angiopathy.
- Histopathological analysis of brain tissue, focusing on white matter lesions.
- Review of computed tomographic (CT) scans from three patients.
Main Results:
- Eight patients exhibited diffuse bilateral myelin loss in hemispheric white matter, sparing specific tracts.
- Microscopic findings included edema, spongiosis, swollen oligodendroglia, and vascular changes.
- CT scans revealed bilateral hypodensities in the hemispheric white matter.
Conclusions:
- White matter changes in diffuse hemorrhagic cerebral amyloid angiopathy resemble those in Binswanger's subcortical encephalopathy.
- Hypoperfusion of distal white matter is proposed as a common pathogenic mechanism.
- These findings highlight a potential link between CAA and leukoencephalopathy.