1) Acute progressive neurologic decline and absence of mass lesion and 2) AAN.com and community features it provides. 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. Karen Roos interviews Drs. Jason Taub and Jeffrey Olson about their paper on acute progressive neurologic decline. In the next segment, Dr. Ryan Overman is reading our e-Pearl of the week about unilateral photophobia or phonophobia in cluster headache. In the next part of the podcast Dr. Ted Burns interviews Dr. Daniel Hoch and Jose Merino about AAN.com and the community features it provides for our Lesson of the Week. The participants had nothing to disclose except Drs. Roos, Olson, Overman, Burns, Hoch, and Jose Merino. Dr. Roos serves as Editor-in-Chief of Seminars in Neurology, received royalties for 4 published textbooks, received funding for traveling from the AAN and other universities, and gave expert testimony, but monies received were forwarded to the Department of Neurology, Indiana University School of Medicine.Dr. Olson serves on the Data Safety Monitoring Board for Monteris, Inc., and has funded clinical research for which he is the Emory PI by Wyeth, Myriad Genetics, Inc., and Baxter International Inc.; and receives research support from the NIH (UO1CA137433-01 [Site PI], R01 CA116174 [Co-I], R01 CA121320-01 [Co-I], and R21 CA141836 [PI]).Dr. Overman serves as Deputy Editor on the Neurology® Resident and Fellow Section editorial team and the Neurology® Podcast Committee.Dr. Burns receives a stipend as Podcast Editor for Neurology®, and performs EMG studies in his neuromuscular practice (30% effort).Dr. Hoch serves as an editorial board member of AAN.com, holds stock options in Merck Serono and Biogen Idec, and gave expert testimony in the trial for the State of Massachusetts, Essex County, 2008-2010.Jose Merino receives a stipend as Associate Editor for AAN.com, serves as an editorial board member of Stroke and receives salary support from NINDS contract with Suburban Hospital.