RT Journal Article SR Electronic T1 Ossification of the posterior longitudinal ligament diagnosed by MR. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 924 OP 925 VO 8 IS 5 A1 Luetkehans, T J A1 Coughlin, B F A1 Weinstein, M A YR 1987 UL http://www.ajnr.org/content/8/5/924.abstract AB