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Cerebral Microbleeds: Detection, Associations and Clinical Implications
1Division of Neurology, Department of Internal Medicine, Saga University Faculty of Medicine, Saga, Japan.
Abstract:
Vigorous investigations for cerebral microbleeds (CMBs) have been made since the late 1990s. CMBs on paramagnetic-sensitive magnetic resonance sequences correspond pathologically to clusters of hemosiderin-laden macrophages and have emerged as an important new imaging marker of cerebral small vessel disease, including intracerebral hemorrhage (ICH). The prevalence of CMBs varies according to the specific disease settings (stroke subtypes and dementing disorders) and is highest (60%) in ICH patients. The associations of CMBs with aging, hypertension and apolipoprotein E genotype are consistent with the two major underlying pathogeneses of CMBs: hypertensive arteriopathy and cerebral amyloid angiopathy (CAA). The distributional patterns of CMBs might help us to understand the predominant small vessel disease pathogenesis in the brain; the strictly lobar type of CMBs often reflects the presence of advanced CAA, while the other types of CMBs, such as 'deep or infratentorial CMBs', including the mixed type, are strongly associated with hypertension. CMBs might be associated with cognitive function (especially executive function), gait performance, and cerebrovascular events (spontaneous, antithrombotic drug-related or post-thrombolysis ICH). In the field of CAA, an understanding of CAA-related CMBs might help to guide decision making with regard to new therapeutic approaches, including the use of monoclonal antibodies against vascular amyloid. These concepts of CMBs might allow us to advance research on ICH as well as for dementia.
Insights
Cerebral microbleeds (CMBs) are key imaging markers for small vessel disease, particularly intracerebral hemorrhage (ICH). Their location and associations with aging and hypertension offer insights into underlying causes like hypertensive arteriopathy and cerebral amyloid angiopathy (CAA).
Area of Science:
- Neurology
- Radiology
- Pathology
Background:
- Cerebral microbleeds (CMBs) are increasingly recognized as critical imaging markers for cerebral small vessel disease.
- Pathologically, CMBs represent hemosiderin-laden macrophages, often associated with intracerebral hemorrhage (ICH).
Purpose of the Study:
- To review the significance of CMBs as an imaging marker for cerebral small vessel disease.
- To explore the associations of CMBs with aging, hypertension, and genetic factors.
- To understand the implications of CMB distribution patterns for identifying underlying pathologies like hypertensive arteriopathy and cerebral amyloid angiopathy (CAA).
Main Methods:
- Review of paramagnetic-sensitive magnetic resonance imaging findings.
- Analysis of CMB prevalence across different disease settings, including stroke and dementia.
- Correlation of CMB distribution patterns (lobar vs. deep/infratentorial) with clinical and pathological factors.
Main Results:
- CMB prevalence is highest (60%) in intracerebral hemorrhage (ICH) patients.
- Associations with aging and hypertension support hypertensive arteriopathy and cerebral amyloid angiopathy (CAA) as key pathogeneses.
- Lobar CMBs often indicate advanced CAA, while deep/infratentorial CMBs are linked to hypertension.
Conclusions:
- CMBs are valuable imaging biomarkers for understanding cerebral small vessel disease and its underlying causes.
- CMB patterns can help differentiate between hypertensive arteriopathy and CAA.
- Further understanding of CMBs may guide therapeutic strategies for ICH and dementia, particularly in CAA.
