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Updated: Mar 19, 2026

Sub-acute Cerebral Microhemorrhages Induced by Lipopolysaccharide Injection in Rats

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Published on: October 17, 2018

Brain microbleeds: Epidemiology and clinical implications.

I Boyano¹, N Bravo², J Miranda²

¹Servicio de Geriatría, Hospital Universitario de Móstoles, Madrid, España.

|June 26, 2016

Summary

Brain microbleeds (BMB) are linked to aging and vascular issues, worsening cognitive decline and increasing mortality risk. Their presence may contraindicate anticoagulant therapy due to heightened hemorrhage risks.

Keywords:

Alzheimer disease Angiopatía amiloide cerebral Brain microbleeds Cerebral amyloid angiopathy Cerebrovascular disease Cognitive impairment Deterioro cognitivo Enfermedad cerebrovascular Enfermedad de Alzheimer Lipohialinosis Lipohyalinosis Microhemorragias cerebrales

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Last Updated: Mar 19, 2026

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Published on: October 17, 2018

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Published on: April 23, 2021

Assessing Cortical Cerebral Microinfarcts on High Resolution MR Images

Assessing Cortical Cerebral Microinfarcts on High Resolution MR Images

Published on: November 20, 2015

Area of Science:

Neurology
Radiology
Pathology

Background:

Brain microbleeds (BMB) are haemosiderin deposits within macrophages, visualized as hypointense signals on specific MRI sequences.
The pathophysiology and clinical significance of BMB remain incompletely understood.

Purpose of the Study:

To review the epidemiology, clinical relevance, and pathology of BMB.
To analyze BMB prevalence, risk factors, and clinical implications across different populations.

Main Methods:

A comprehensive literature review of epidemiological, clinical, and anatomical pathology studies on BMB.
Analysis of studies in the general population, patients with vascular disease, and those with cognitive impairment.

Main Results:

BMB prevalence varies significantly: 3-27% (general population), 6-80% (vascular disease patients), and 16-45% (cognitive impairment patients).
BMB are associated with aging, Alzheimer disease, and cerebrovascular diseases (hemorrhagic/ischemic).
Pathological substrates include lipohyalinosis (subcortical) and cerebral amyloid angiopathy (lobar).

Conclusions:

BMB worsen cognitive impairment and increase mortality, primarily from vascular causes.
Multiple lobar BMB suggest cerebral amyloid angiopathy, increasing cerebral hemorrhage risk and potentially contraindicating anticoagulants.
Careful consideration of anticoagulant therapy is needed, with MRI and clinical follow-up aiding decision-making in lower-risk patients.