TY - JOUR T1 - Is There a Need for Contrast Administration Prior to CT-Guided Cervical Nerve Root Block? JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - E45 LP - E45 DO - 10.3174/ajnr.A3544 VL - 34 IS - 4 AU - T.M. Ryan AU - E.C. Kavanagh AU - P.J. MacMahon Y1 - 2013/04/01 UR - http://www.ajnr.org/content/34/4/E45.abstract N2 - ER -