TY - JOUR T1 - A Clear and Present Danger? JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - 1634 LP - 1636 VL - 22 IS - 9 AU - David M. Yousem Y1 - 2001/10/01 UR - http://www.ajnr.org/content/22/9/1634.abstract N2 - ER -