The isolated single coronary artery is a rare congenital anomaly, in which both coronary arteries arise from a solitary ostium. Diagnosis of coronary anomalies and identification of the exact anatomy of coronary arteries has significant clinical importance, hence, myocardial ischemia or sudden cardiac death is usually related to its course of anomalous coronary artery. Most patients with a single coronary artery are asymptomatic and have normal electrocardiogram and negative stress tests. However, if the patient has other structural abnormalities, for example, ventricular hypertrophy, the exam is determined. This report describes a case of single coronary artery, where the right coronary artery originated from the distal left circumflex artery in a patient with hypertrophic ardiomyopathy.

Introduction
 Case report
 Discussion
 References

• Hyeon Cheol Koh(Department of Internal Medicine, Gwang-Myeong SungAe General Hospital) | 고현철
• Dae Hee Hahn(Department of Internal Medicine, Gwang-Myeong SungAe General Hospital) | 한대희
• Tae Seob Jung(Department of Internal Medicine, Gwang-Myeong SungAe General Hospital) | 정태섭
• Kyung Deuk Park(Department of Internal Medicine, SungAe General Hospital) | 박경득
• Moo Hyun Lee(Department of Internal Medicine, SungAe General Hospital) | 이무현
• Gi Soo Park(Department of Internal Medicine, Gwang-Myeong SungAe General Hospital) | 박기수
• Gyung Jung Kim(Department of Internal Medicine, Gwang-Myeong SungAe General Hospital) | 김경중
• Sang Chil Lee(Department of Internal Medicine, Gwang-Myeong SungAe General Hospital) | 이상칠 Corresponding author