title: Absence of the right common carotid artery.
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.
authors.affiliation: Unit 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
authors.forename: Alfonso
authors.initials: A
authors.lastname: Cerase
authors.forename: Elisa
authors.initials: E
authors.lastname: Rubenni
authors.forename: Rossana
authors.initials: R
authors.lastname: Tassi
authors.forename: Maria Laura
authors.initials: ML
authors.lastname: Stromillo
authors.forename: Carlo
authors.initials: C
authors.lastname: Venturi
mesh_terms: D000328:Adult; D017536:Carotid Artery, Common / Q000002:abnormalities*; D003287:Contrast Media; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D018615:Ultrasonography, Doppler, Color
chemical_list: D003287:Contrast Media