title: Type I proatlantal artery with bilateral absence of the external carotid arteries.
abstract: During color Doppler examination of a 41-year-old man who presented with vertigo, a right vertebral artery could not be found. Both MR angiography and digital subtraction angiography revealed a large anastomotic vessel between the right internal carotid and vertebral artery. It was thought to be type I proatlantal artery. Furthermore, the external carotid arteries were bilaterally absent. Although each vascular anomaly mentioned above is rare, it even more rare for these variations to occur simultaneously.
authors.affiliation: Department of Radiology, GATA Haydarpasa Training Hospital, Istanbul, Turkey.
authors.forename: C Cinar
authors.initials: CC
authors.lastname: Basekim
authors.forename: Emir
authors.initials: E
authors.lastname: Silit
authors.forename: Hakan
authors.initials: H
authors.lastname: Mutlu
authors.forename: M Zekai
authors.initials: MZ
authors.lastname: Pekkafali
authors.forename: Ersin
authors.initials: E
authors.lastname: Ozturk
authors.forename: Esref
authors.initials: E
authors.lastname: Kizilkaya
mesh_terms: D000328:Adult; D015901:Angiography, Digital Subtraction; D001027:Aortography; D002342:Carotid Artery, External / Q000002:abnormalities* / Q000473:pathology; D002343:Carotid Artery, Internal / Q000002:abnormalities / Q000473:pathology; D020785:Central Nervous System Vascular Malformations / Q000175:diagnosis*; D001270:Cervical Atlas / Q000098:blood supply*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D018810:Magnetic Resonance Angiography; D008297:Male; D012680:Sensitivity and Specificity; D018615:Ultrasonography, Doppler, Color; D014711:Vertebral Artery / Q000002:abnormalities* / Q000473:pathology