 This is prospective, observational study, that will be conducted in two high-volume university interventional cardiology centers. Study population consists of patients with true coronary bifurcations Medina 1.0.1; 0.1.1; 1.1.1 with 50 stenosis in both main MB and side branch SB. Patients are scheduled to undergo percutaneous coronary intervention PCI based on clinical findings. Before PCI, patients will undergo multislice CT angiography MSCTA. 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. Patients will be seen in the office visit at 1, 3, 6 and 12 months after the procedure. Clinical evaluation and 12-channel ECG are mandatory at each visit. Comprehensive echocardiogram with 2D-strain analysis will be done at 3-month visit. Repeated coronary angiography will be done at 6-month visit, and will include quantitative analysis of previously treated bifurcation lesion. 