SPINE An International Journal for the study of the spine, Publish Ahead of Print DOI: 10.1097/BRS.0000000000002951 The Anatomic Characteristics of the Retroperitoneal Oblique Corridor to the L1–S1 Intervertebral Disc Spaces Wang Kai, M.D 1 , Zhang Can, M.M 1 , Wu Hao, M.D 1* , Chen Zan, M.D 1 , Dean Chou 2 , Fengzeng Jian, M.D 1* 1 Department of Neurosurgery, Xuanwu Hospital of Capital Medical University, 100053, China 2 Department of Neurosurgery, University of California San Francisco, 94143, US * Corresponding to: Wu Hao, 45 Changchun Street, Beijing, China, 100053. E-mail: 13901397527@139.com. Tel +86-10 83158632; FAX: +86-10 83198836. * Corresponding to: Fengzeng Jian 45 Changchun Street Beijing, China, 100053 E-mail: Fengzengjian@hotmail.com. Tel +86-10 83156814; FAX: +86-10 83198836. The manuscript submitted does not contain information about medical device(s)/drug(s). No funds were received in support of this work. Relevant financial activities outside the submitted work: grants. Copyright © 2018 Wolters Kluwer Health, Inc. Unauthorized reproduction of this article is prohibited.