RT Journal Article SR Electronic T1 Acute traumatic vacuum sign. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 973 OP 974 VO 7 IS 5 A1 Bohrer, S P YR 1986 UL http://www.ajnr.org/content/7/5/973.abstract AB