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Updated: Jun 22, 2026

Transient Middle Cerebral Artery Occlusion Model of Stroke
Published on: August 11, 2023
Absence of the right common carotid artery
Alfonso Cerase1, Elisa Rubenni, Rossana Tassi
1Unit of Diagnostic and Therapeutic Neuroradiology, Department of Neurosciences, Interdepartmental Center of Magnetic Resonance, Azienda Ospedaliera Universitaria Senese, Policlinico Santa Maria alle Scotte, Viale Mario Bracci, 16, 53100, Siena, Italy. alfonsocerase@aliceposta.it
Abstract:
In a 33-year-old male patient with multiple sclerosis, brain magnetic resonance imaging incidentally showed a narrow right intracranial internal carotid artery. Gadolinium-enhanced magnetic resonance angiography showed absence of the right common carotid artery. Right external and internal carotid arteries arose separately from the ipsilateral innominate artery and subclavian artery, respectively. Color-Doppler ultrasound confirmed this finding. Embriologically, the case could be interpreted as the disappearance of the third aortic arch with persistence of the carotid duct connecting the third and fourth aortic arches.
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