Figure 4b. PDA. (a, b) Coronal oblique maximum intensity projection images show the PDA branch (arrow) and posterolateral left ventricular branches (arrowheads) of the RCA. (c, d) Axial oblique (c) and posterior coronal (d) volume-rendered images show the PDA (arrow) coursing in the posterior interventricular groove and the posterolateral left ventricular branch (arrowhead). RV = right ventricle.