 This is prospective, observational study, that will be conducted in two high-volume university PCI centers. The centers are: Clinical Hospital Center Zemun-Belgrade, Cardiology Department, and Clinical Center of Serbia, Cardiology Clinic. Study population consists of patients with true coronary bifurcations Medina 1.0.1; 0.1.1; 1.1.1 with 50 stenosis in both MB and SB9. Patients are scheduled to undergo PCI based on clinical findings. Before PCI, patients will undergo MSCTA. Study hypothesis is that MSCTA before PCI for true non left main bifurcation lesions can determine atherosclerotic plaque characteristics in MB and SB and predict significant narrowing of SB after provisional stenting. Primary goal is to determine which plaque characteristics of true non left main bifurcation lesions in MB and SB, as assessed by MSCTA, can affect the occurrence of SB ostial compromise after provisional stenting. Plaque characteristics that will be investigated include: angle between the arteries, the degree of stenosis, length of stenosis, density of the plaque, plaque volume, positive remodeling of the artery, and presence of spotty calcifications. 