RT Journal Article SR Electronic T1 Mass Effect in the Thoracic Spine from Remnant Bone Wax: An MR Imaging Pitfall JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 844 OP 846 DO 10.3174/ajnr.A1830 VO 31 IS 5 A1 Stein, J.M. A1 Eskey, C.J. A1 Mamourian, A.C. YR 2010 UL http://www.ajnr.org/content/31/5/844.abstract AB SUMMARY: Bone wax used in neurosurgical procedures is a rare cause of complications after surgery. We present a patient who developed paraplegia following thoracic spine surgery. A subsequent MR imaging study demonstrated a signal void that resembled postoperative air but appeared to cause cord compression and proved after a second surgery to represent bone wax. Recognizing the MR imaging and CT characteristics of bone wax is important to prevent mistaking it for residual air in postoperative imaging.