RT Journal Article SR Electronic T1 Spinal Extradural Granulomas JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 205 OP 210 VO 16 IS 4 A1 John R. Hannan A1 Richard L. Mason YR 1949 UL http://www.ccjm.org/content/16/4/205.abstract AB