Update on hemicrania continua.

"Disclosures Dr. E. Cittadini: none; Dr. Peter J. Goadsby has served as a board member for Allergan; CoLucid Pharmaceuticals; MAP Pharmaceuticals, Inc.; Merck, Sharpe, and Dohme; Neuralieve; NeurAxon; ATI Pharmaceuticals; Minster Pharmaceuticals; Boehringer-Ingelheim; Boston Scientific; Coherex; Eli Lilly and Co.; Medtronic; and Linde Industrial Gases; has served as a consultant for Bristol-Myers Squibb, Pfizer, NeuroTherapeutics Pharma, Vertex Pharmaceuticals, Valeant, AstraZeneca, and Kalypsys; has provided expert testimony on behalf of MedicoLegal; has received grants or has grants pending with GlaxoSmithKline; MAP Pharmaceuticals, Inc.; Merck, Sharpe, and Dohme; Neuralieve; and Boston Scientific; has received payment for speaking from Merck, Sharpe, and Dohme and Almirall; and has received payment for the development of educational presentations from the American Headache Society."