Light-induced Hemiplegia, an Atypical Case of Retinal Steal SyndromeKerek, David MD; Al Kasab, Sami MD; Antonucci, Michael U. MD; Turner, Raymond D. IV MD; Turan, Tanya N. MD, MSNeurologist: March 2017 - Volume 22 - Issue 2 - p 57–60 doi: 10.1097/NRL.0000000000000109 Case Report/Case Series Abstract Author Information Atherosclerosis affecting the carotid arteries accounts for up to 20% of ischemic strokes 1. The clinical effects of atherosclerotic occlusive disease vary according to multiple factors, one of which is collateral circulation. In response to a chronic decrease in cerebral perfusion from atherosclerotic occlusion, alternative flow pathways, or collaterals, develop in a variety of patterns. In the setting of carotid occlusion, flow from the Circle of Willis, if complete, often comprises the main cerebral collateral network. In addition, contributions from leptomeningeal and extracranial to intracranial collaterals may develop. In the latter, reversal of flow in the ophthalmic artery can reconstitute to restore supraclinoid internal carotid artery flow. We report a case of the unusual sequela of a collateral flow pattern via the ophthalmic artery that induces a unique retinal steal phenomenon. Departments of *Neurology †Radiology ‡Neurosurgery, Medical University of South Carolina, Charleston, SC The authors declare no conflict of interest. Reprints: Tanya N. Turan, MD, MS, MUSC Stroke Program 19, Hagood Avenue, Suite 501, Harborview Office Tower, Charleston, SC 29425. E-mail: firstname.lastname@example.org. Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.