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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 25:1619-1621, October 2004
© 2004 American Society of Neuroradiology

Case Report
HEAD AND NECK

Type I Proatlantal Artery with Bilateral Absence of the External Carotid Arteries

C. Cinar Basekim^a, Emir Silit^a, Hakan Mutlu^a, M. Zekai Pekkafali^a, Ersin Ozturk^b and Esref Kizilkaya^a

^a Department of Radiology, GATA Haydarpasa Training Hospital, Istanbul, Turkey
^b Department of Radiology, Aksaz Naval Hospital, Mugla, Turkey

Address correspondence to Ersin Ozturk, MD, Department of Radiology, Aksaz Naval Hospital, Marmaris 48700, Mugla, Turkey

Summary: 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.

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