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The ICA was hypoplastic. A left accessory MCA was also observed. Although blood flow in the right ICA was decreased, the patient was asymptomatic; thus, conservative treatment was administered, and her clinical course remained uneventful.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Absence of the CCA is associated with the development of the aorta and various vascular variations; however, to our knowledge, this is the first report of an association with a contralateral accessory MCA, the existence of which may be considered incidental. Preoperative knowledge of this rare variation is important when considering endovascular treatment of cerebral aneurysms and other arterial lesions.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00276-025-03658-0","type":"journal-article","created":{"date-parts":[[2025,5,24]],"date-time":"2025-05-24T01:33:44Z","timestamp":1748050424000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Absent right common carotid artery associated with left accessory middle cerebral artery diagnosed by computed tomography angiography"],"prefix":"10.1007","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-7404-7389","authenticated-orcid":false,"given":"Atsushi","family":"Hashio","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akira","family":"Uchino","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaima","family":"Suzuki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yasutaka","family":"Baba","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroki","family":"Kurita","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,5,24]]},"reference":[{"key":"3658_CR1","doi-asserted-by":"publisher","first-page":"1418","DOI":"10.1016\/j.jvs.2012.11.138","volume":"59","author":"V Berczi","year":"2014","unstructured":"Berczi V, Bottomley JR, Gopalan D, Griffiths PD, Gaines PA, Cleveland TJ (2014) Absent right common carotid artery with stenting of symptomatic internal carotid artery stenosis. 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