TORONTO--(BUSINESS WIRE)--Biogen Idec (NASDAQ: BIIB) and Elan Corporation, plc (NYSE: ELN) today announced 15 company-sponsored platform and poster presentations at the American Academy of Neurology’s (AAN) 62nd Annual Meeting in Toronto, April 10 – 17, 2010. The AAN Annual Meeting is the world’s largest gathering of neurologists. The presented data, based on post-hoc analyses and patient-reported outcomes studies, highlights the ability of TYSABRI (natalizumab), in some multiple sclerosis (MS) patients, to improve sustained visual function, disability, overall quality of life (QoL), cognition and fatigue.