TY - JOUR T1 - Type I Proatlantal Artery with Bilateral Absence of the External Carotid Arteries JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - 1619 LP - 1621 VL - 25 IS - 9 AU - C. Cinar Basekim AU - Emir Silit AU - Hakan Mutlu AU - M. Zekai Pekkafali AU - Ersin Ozturk AU - Esref Kizilkaya Y1 - 2004/10/01 UR - http://www.ajnr.org/content/25/9/1619.abstract N2 - 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. ER -