Correspondence to Sung-Ho Her, M.D. Department of Internal Medicine, Daejeon St. Mary’s Hospital, 64 Daeheung-ro, Jung-gu, Daejeon 301-723, Korea Tel: +82-42-220-9504, Fax: +82-42-253-9505, E-mail: hhhsungho@naver.com Copyrightc 2013 The Korean Association of Internal Medicine This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 단일관상동맥: 좌회선지 원위부에서 기원하는 우관상동맥