REPORT FROM THE 63rd ANNUAL MEETING OF THE AMERICAN ACADEMY OF NEUROLOGY (AAN), HONOLULU, HAWAII, APRIL 9-16, 2011- Three new studies presented at the AAN annual meeting have failed to provide supportive evidence of chronic cerebrospinal venous insufficiency (CCSVI)in MS.

A Canadian study investigated venous anomalies in 67 subjects with clinically definite MS, possible MS, clinically isolated syndrome (CIS), or not-MS (Alikhani et al. AAN 2011; abstract S01.006). Nineteen of 34 CDMS patients had relapsing-remitting MS, 9 had secondary-progressive MS and 6 had primary progressive MS. All subjects underwent contrast-enhanced magnetic resonance venography (MRV).