Figure 4. Lateral cineangiograms during balloon valvuloplasty for pulmonary valve stenosis. Panel A shows the inflated balloon catheter positioned across the pulmonary valve with a mid-balloon waist (indicated by the red arrow), reflecting the stenotic region. Panel B shows the successful dilation of the pulmonary valve, with the balloon fully inflated and no residual waist (outlined in red), indicating the absence of stenosis. The procedure resulted in a significant drop in transvalvular pressure, confirming the effectiveness of the valvuloplasty.