Leading Cause of Stroke in Young Going Untreated -- and It Shouldn't, Study Says (image) University of Virginia Health System Share Print E-Mail Caption Jason Sheehan, MD, PhD, is the director of the University of Virginia Health System's Gamma Knife Center. Credit UVA Health System Usage Restrictions May be used by reporters and webmasters to accompany coverage of the AVM study. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.