RT Journal Article SR Electronic T1 Retropulsion of Ruptured Nucleus Pulposus Simulating Tumor of the Cauda Equina JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 257 OP 260 VO 7 IS 4 A1 Bunts, A. T. YR 1940 UL http://www.ccjm.org/content/7/4/257.abstract AB