Tehran University of Medical Sciences The Research in Heart Yield and Translational Medicine (RHYTHM) 3115-7270 13 1 2018 02 24 35 37 EN Burak Açar Department of Cardiology, Yuksek Ihtisas Heart-Research and Education Hospital, Ankara, Turkey. Sefa Ünal Department of Cardiology, Yuksek Ihtisas Heart-Research and Education Hospital, Ankara, Turkey. Çağrı Yayla Department of Cardiology, Yuksek Ihtisas Heart-Research and Education Hospital, Ankara, Turkey. Ahmet Ertem Department of Cardiology, Yuksek Ihtisas Heart-Research and Education Hospital, Ankara, Turkey. Bihter Şentürk Department of Cardiology, Yuksek Ihtisas Heart-Research and Education Hospital, Ankara, Turkey. Mustafa Özdemir Department of Radiology, Yuksek Ihtisas Heart-Research and Education Hospital, Ankara, Turkey. Mustafa Balcı Department of Cardiology, Yuksek Ihtisas Heart-Research and Education Hospital, Ankara, Turkey. Orhan Maden Department of Cardiology, Yuksek Ihtisas Heart-Research and Education Hospital, Ankara, Turkey. 2016 09 07 2017 07 30 Coronary artery aneurysms are rare findings in patients referred for coronary angiography. Their prevalence ranges between 0.2% and 6% in different case series. We describe a male patient with a huge left main coronary artery aneurysm causing exertional angina, which was diagnosed with coronary angiography. All of the left coronary system arose from the aneurysm. He underwent coronary angiography again, followed by multislice computed tomography with a three-dimensional reconstruction. Although there is no known standard treatment modality for such aneurysms, we planned medical therapy after consultation with the cardiovascular surgery department. The patient’s first visit was in March 2013, and he was thereafter followed up until September 2016. https://rhythm.tums.ac.ir/index.php/jthc/article/view/606