Small Vessel Disease of the Brain: Unravelling Pathogenic Mechanisms, Neuroimaging Signatures, and Therapeutic Frontiers

Deshpande A, Khardenavis V and Shetty A

Published on: 2026-03-08

Abstract

Background: Cerebral small vessel disease (CSVD) is the most prevalent pathology underlying vascular cognitive impairment and the second most common cause of dementia after Alzheimer disease. It accounts for approximately 25% of all ischemic strokes and is the dominant etiology of intracerebral hemorrhage in the elderly. Despite its enormous clinical burden, CSVD has historically been under recognized and inadequately treated, largely because its insidious, cumulative nature evades the acute-event framework that dominates cerebrovascular medicine. Recent advances in neuroimaging, molecular biology, and genetic epidemiology have fundamentally transformed our understanding of the mechanisms driving small vessel injury and have opened novel therapeutic avenues.

Objective: This review provides a comprehensive synthesis of the current understanding of CSVD pathogenesis, evaluates the evolving neuroimaging paradigm for disease characterization and monitoring, and critically appraises established and investigational therapeutic strategies.

Methods: A structured narrative review was conducted by searching PubMed, Scopus, Embase, and the Cochrane Library for English-language articles published between January 2010 and December 2025. Search terms included cerebral small vessel disease, white matter hyperintensities, lacunar stroke, cerebral microbleeds, perivascular spaces, blood-brain barrier, endothelial dysfunction, vascular cognitive impairment, and related terms. Original research, systematic reviews, meta-analyses, and landmark clinical trials were included.

Results: CSVD pathogenesis extends well beyond the traditional arteriosclerotic-lipohyalinotic paradigm to encompass endothelial dysfunction, blood-brain barrier breakdown, chronic low-grade neuroinflammation, impaired glymphatic clearance, and pericyte degeneration. Magnetic resonance imaging has established a robust portfolio of CSVD markers, including white matter hyperintensities, lacunes, cerebral microbleeds, enlarged perivascular spaces, and brain atrophy, each carrying distinct pathological and prognostic implications. Emerging quantitative techniques, including diffusion tensor imaging, arterial spin labeling perfusion mapping, and dynamic contrast-enhanced permeability imaging, are enabling earlier detection and mechanistic phenol typing. Therapeutically, intensive blood pressure lowering remains the only intervention with robust trial evidence for slowing CSVD progression. However, promising investigational approaches targeting endothelial restoration, neuroinflammation, phosphodiesterase inhibition, and glymphatic enhancement are in various stages of preclinical and early clinical evaluation.

Conclusions: CSVD is a dynamic, heterogeneous disorder whose clinical consequences, ranging from lacunar stroke and vascular dementia to gait impairment and mood disturbance, arise from shared but mechanistically distinct pathways of small vessel injury. A paradigm shift from reactive treatment of its acute manifestations to proactive, mechanism-targeted, and individualized prevention strategies is essential to mitigate the accelerating global burden of vascular cognitive impairment.