RT Journal Article SR Electronic T1 Bilateral Segmental Agenesis of the Vertebrobasilar Junction: Developmental and Angiographic Anatomy JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A0719 A1 I.M. Burger A1 F. Siclari A1 L. Gregg A1 P. Gailloud YR 2007 UL http://www.ajnr.org/content/early/2007/09/26/ajnr.A0719.abstract AB