PT - JOURNAL ARTICLE AU - M. Castillo TI - Perspectives AID - 10.3174/ajnr.A2929 DP - 2011 Dec 15 TA - American Journal of Neuroradiology 4099 - http://www.ajnr.org/content/early/2011/12/15/ajnr.A2929.short 4100 - http://www.ajnr.org/content/early/2011/12/15/ajnr.A2929.full