We attended 83rd. AANS Annual Scientific Meeting in Washington DC between May 1 and 6, 2015. Prof. Kuroda gave a lecture on strategy and management of incidental cerebrovascular disorders in Practical Clinics for 30 min. Dr. Emiko Hori presented the data on natural course of anterior communicating artery aneurysm in Toyama. Dr. Daina Kashiwazaki presented the data on the role of endothelial progenitor cells in the development of carotid artery plaque. See you in Chicago one year later.