RT Journal Article SR Electronic T1 Reply: JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A3364 A1 A. Khosla A1 W. Brinjikji A1 H. Cloft A1 G. Lanzino A1 D.F. Kallmes YR 2012 UL http://www.ajnr.org/content/early/2012/09/27/ajnr.A3364.abstract AB