The size of the LVS may vary and does not correlate with BMI, sex or age. The distance from left coronary artery bifurcation to the first septal perforator (length of the LVS septal margin) (Figure 3) and the angle of left coronary artery bifurcation determine the LVS size. The mean size of LVS measured in computed tomography is 263 mm2, with the mean inaccessible area being significantly bigger than the accessible area (133 vs. 95 mm2). A Yamada equation calculation identifies the area with a high correlation to real LVS size [8,15].