TY - JOUR T1 - Bilateral Type 1 Proatlantal Arteries with Absence of Vertebral Arteries JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - 418 LP - 420 VL - 22 IS - 2 AU - Richard J. Woodcock AU - Harry J. Cloft AU - J. E. Dion Y1 - 2001/02/01 UR - http://www.ajnr.org/content/22/2/418.abstract N2 - Summary: The persistent proatlantal artery is a well-described communication between the carotid and vertebrobasilar system. However, persistence of bilateral proatlantal arteries is exceptionally rare. Although usually noted as an incidental finding, the presence of a proatlantal artery, particularly when bilateral, may result in unusual symptoms or may have implications for therapy. We report a case of bilateral proatlantal arteries, describe their embryology, and consider potential clinical implications of this finding. ER -