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Pathologic findings of silent hyperintense white matter lesions on MRI
1Department of Neurology, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo, Japan. takao@mc.med.keio.ac.jp
Abstract:
The pathologic features of silent hyperintense white matter lesions in T2-weighted images on MRI were studied in patients with no neurologic signs or symptoms. The small patchy hyperintense white matter lesions represented myelin pallor associated with vessels showing hypertension and arteriosclerotic changes. 'Caps' also showed myelin pallor with dilated perivascular spaces. There were no lacunar infarcts in these lesions. Some of 'caps' was shown to be elongated normal lateral ventricle. 'Rims' of early stage revealed subependymal gliosis that was a part of normal aging processes.
Insights
Silent white matter lesions on MRI, often linked to aging, show myelin damage and vascular changes, not infarcts. These findings in asymptomatic individuals highlight normal aging processes.
Area of Science:
- Neuropathology
- Neuroradiology
- Vascular Neurology
Background:
- Silent white matter lesions are common findings on MRI in asymptomatic individuals.
- The underlying pathologic features of these lesions are not fully understood.
- Understanding these lesions is crucial for differentiating normal aging from disease processes.
Purpose of the Study:
- To investigate the pathologic features of silent hyperintense white matter lesions observed on T2-weighted MRI.
- To correlate imaging findings with histopathologic changes in patients without neurological symptoms.
Main Methods:
- Histopathologic examination of brain tissue from patients with asymptomatic white matter lesions.
- Analysis of T2-weighted MRI scans to identify lesion characteristics.
- Correlation of imaging features with microscopic findings, including myelin, vasculature, and glial changes.
Main Results:
- Small, patchy white matter lesions were characterized by myelin pallor associated with vascular hypertension and arteriosclerosis.
- 'Caps' lesions exhibited myelin pallor and dilated perivascular spaces, with some identified as elongated lateral ventricles.
- No evidence of lacunar infarcts was found within these specific lesions; 'rims' indicated subependymal gliosis consistent with aging.
Conclusions:
- Silent white matter lesions in asymptomatic individuals primarily represent myelin pallor and vascular changes, not infarcts.
- These findings are largely attributable to normal aging processes, including subependymal gliosis.
- Distinguishing these age-related changes from pathological conditions is essential for accurate clinical interpretation.