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Their contributions to lacunar stroke and cerebral small-vessel disease (cSVD) remain contentious. We investigated the associations of large-artery stenosis (LAS) and arterial widening with stroke subtype, cSVD markers, incident infarcts, and clinical outcomes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>METHODS:<\/jats:title>\n                    <jats:p>We prospectively recruited patients with lacunar or mild nonlacunar stroke, with demographic, stroke-related, cognitive, functional, and magnetic resonance imaging (index and incident infarcts, cSVD markers) assessments at baseline and 1 year. LAS was defined as \u226550% intracranial or cervical artery stenosis; basilar artery dolichoectasia was defined by basilar artery diameter, bifurcation height, and lateral displacement; and intracranial carotid and middle cerebral artery diameters were also measured. Associations were estimated from multivariable logistic, linear, and proportional odds regression models adjusted for age, sex, and vascular risk factors. We further conducted a systematic literature review to synthesize evidence on relationships between large-artery pathology and cSVD.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>RESULTS:<\/jats:title>\n                    <jats:p>\n                      Among 229 patients (mean age, 65.9\u00b111.1 years; 131 [57.2%] lacunar stroke), LAS and basilar artery dolichoectasia were present in 20.5% and 15.7%, respectively. After adjustment, LAS (odds ratio, 0.49 [95% CI, 0.23\u20130.99]) and the presence of any embolic source were associated with lower odds of lacunar versus non-lacunar stroke, and not with cSVD markers or incident infarcts. In contrast, basilar artery dolichoectasia was strongly associated with lacunar stroke (odds ratio, 4.67 [95% CI, 1.87\u201313.14]), higher cSVD scores (ordinal analysis; odds ratio, 2.57 [95% CI, 1.28\u20135.25]), incident infarcts (75% subcortical; odds ratio, 2.29 [95% CI, 1.01\u20135.14]), and greater progression of white matter hyperintensities over 1 year (\u03b2, 0.15 [95% CI, 0.01\u20130.29] per log\n                      <jats:sub>10<\/jats:sub>\n                      -transformed volume). Similar associations were observed for wider intracranial arteries. The systematic review supported these findings.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>CONCLUSIONS:<\/jats:title>\n                    <jats:p>cSVD, including lacunar stroke, was unrelated to LAS but strongly associated with dolichoectasia and wider arteries. These findings support a nonatheromatous, intrinsic microvascular pathology, particularly segmental arteriolar disorganization, as the principal mechanism of lacunar stroke and cSVD. Mechanism-specific diagnostic and therapeutic strategies are warranted.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1161\/circulationaha.126.079493","type":"journal-article","created":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T15:25:06Z","timestamp":1778081106000},"page":"1813-1826","update-policy":"https:\/\/doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":5,"title":["Implications of Cranial Arterial Stenosis and Dolichoectasia for Cerebral Small-Vessel Disease Etiopathogenesis: Findings From a Prospective Mild Stroke Cohort"],"prefix":"10.1161","volume":"153","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2720-392X","authenticated-orcid":true,"given":"Fei","family":"Han","sequence":"first","affiliation":[{"name":"Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (F.H., 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