
Keywords: شریان اصلی عروق کرونر سمت چپ بدون حفاظت; ULMCA; unprotected left main coronary artery; LCx; left circumflex artery; IVUS; intravascular ultrasound; LAD; left anterior descending artery; PSN-LCx; post-stenting-narrowing at the circumflex ostium; CABG; coronary bypass surgery; PCI; percutaneous co