1) Etiological investigation of ischemic stroke and 2) Topic of the month: Unusual headache syndromes. This podcast for the Neurology Journal begins and closes with Dr. Robert Gross, Editor-in-Chief, briefly discussing highlighted articles from the print issue of Neurology. In the second segment Dr. Justin Sattin interviews Dr. Vincent Larrue about his paper on etiological investigation of ischemic stroke. In the next segment, Dr. Stacy Clardy is reading our e-Pearl of the week about clinical signs of psychogenic non-epileptic seizures. In the next part of the podcast Dr. Michael Levy interviews Dr. Todd Rozen about trigeminal autonomic cephalgia. Next week you will hear our last interview for this month on unusual headache syndromes. The participants had nothing to disclose except Drs. Larrue, Song Levy and Rozen.Dr. Larrue has received funding for travel from Boehringer Ingelheim and received research support from sanofi-aventis.Dr. Clardy serves on the editorial team for the Neurology® Resident and Fellow Section. Dr. Levy receives research support from ApoPharma Inc. and Guthy-Jackson Foundation and is funded by the NIH Loan Repayment Grant.Dr. Rozen serves on the speakers' bureau of Merck Serono.