Negative CT Angiography Findings in Patients with Spontaneous Subarachnoid Hemorrhage: When is Digital Subtraction Angiography Still Needed?
AJNR 31:695-705, Agid,R., et al, 2010
Spinal Dural Arteriovenous Fistulas
AJNR 30:639-648, Krings,T. &Geibprasert,S., 2009