Base of LVS – arcuate line
The base of the LVS may be defined as a curved line, with the radius of this arc being the distance from the left coronary artery bifurcation to the first dominant septal perforator originating from the left anterior descending artery [8]. Thus, the base of the LVS creates an imaginary line over the left ventricle’s epicardial surface that may be trespassed by ramus intermedius, diagonal branches and obtuse marginal branches of the left coronary artery (Figure 2B). Moreover, in some cases, the venous system (represented by the anterior interventricular vein or great cardiac vein with tributaries) may cross the arcuate line.