Vascular Neoplasms and Malformations, Ischemia, and Hemorrhage Affecting the Spinal Cord:MR Imaging Findings
AJR 162:685-692, Friedman,D.P.,et al, 1994
Intracranial Vertebrobasilar Stenosis: Angioplasty and Follow-Up
AJNR 21:1293-1301, Nahser,H.C. et al, 2000