Tehran University of Medical Sciences The Research in Heart Yield and Translational Medicine (RHYTHM) 3115-7270 13 1 2018 02 24 32 34 EN Kahraman Coşansu Department of Cardiology, Sakarya University Training and Research Hospital, Sakarya, Turkey. Mustafa Ağaç Department of Cardiology, Sakarya University Training and Research Hospital, Sakarya, Turkey. Harun Kılıç Department of Cardiology, Sakarya University Training and Research Hospital, Sakarya, Turkey. Ramazan Akdemir Department of Cardiology, Sakarya University Training and Research Hospital, Sakarya, Turkey. Hüseyin Gündüz Department of Cardiology, Sakarya University Training and Research Hospital, Sakarya, Turkey. 2017 01 06 2017 08 23 A circumflex artery originating from an ostium apart from the left main artery is one of the most common coronary artery anomalies. However, a dual origin of the circumflex artery is an extremely rare anomaly. We describe a 55-year-old male patient admitted to our clinic with the diagnosis of unstable angina. Angiography revealed twin circumflex arteries: one from the left main artery and the other from the proximal right coronary artery and a stenotic left anterior descending coronary artery (LAD). The patient was treated with percutaneous coronary intervention on the LAD lesion. His overall condition was good at 2 weeks’ follow-up. https://rhythm.tums.ac.ir/index.php/jthc/article/view/643 https://rhythm.tums.ac.ir/index.php/jthc/article/download/643/649