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Degree of stenosis was diagnosed on CTA. Mean blood flow rates were assessed with four-dimensional phase-contrast MRI.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>We included 110 patients of which 83% were symptomatic, and 38% had near-occlusion. Near-occlusions had lower mean internal carotid artery flow (70\u00a0ml\/min) than conventional\u2009\u2265\u200950% stenoses (203\u00a0ml\/min, P\u2009&lt;\u2009.001). Definite use of\u2009\u2265\u20091 collateral was found in 83% (35\/42) of near-occlusions and 10% (7\/68) of conventional stenoses (P\u2009&lt;\u2009.001). However, there were no differences in total cerebral blood flow (514\u00a0ml\/min vs. 519\u00a0ml\/min, P\u2009=\u2009.78) or ipsilateral hemispheric blood flow (234 vs. 227\u00a0ml\/min, P\u2009=\u2009.52), between near-occlusions and conventional\u2009\u2265\u200950% stenoses, based on phase-contrast MRI flow rates. There were no differences in total cerebral or hemispheric blood flow, or collateral use, between symptomatic and asymptomatic near-occlusions.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Near-occlusions have lower internal carotid artery flow rates and more collateral use, but similar total cerebral blood flow and hemispheric blood flow, compared to conventional\u2009\u2265\u200950% carotid stenosis.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00234-024-03309-y","type":"journal-article","created":{"date-parts":[[2024,2,24]],"date-time":"2024-02-24T11:02:12Z","timestamp":1708772532000},"page":"589-599","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Phase-contrast magnetic resonance imaging of intracranial and extracranial blood flow in carotid near-occlusion"],"prefix":"10.1007","volume":"66","author":[{"given":"Madelene","family":"Holmgren","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexander","family":"Henze","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anders","family":"W\u00e5hlin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anders","family":"Eklund","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Allan J.","family":"Fox","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5317-4563","authenticated-orcid":false,"given":"Elias","family":"Johansson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,2,24]]},"reference":[{"key":"3309_CR1","doi-asserted-by":"publisher","first-page":"2","DOI":"10.3174\/ajnr.A4432","volume":"37","author":"E Johansson","year":"2016","unstructured":"Johansson E, Fox AJ (2016) Carotid near-occlusion: a comprehensive review, part 1\u2014 definition, terminology, and diagnosis. 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