Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dual lead left - sided pacemaker is seen at least 3 expected position of the right ventricle . The cardiac silhouette remains moderately enlarged . Mediastinal contours are stable . Patient is status post median sternotomy and CABG . No pleural effusion or pneumothorax is seen . There is mild to moderate pulmonary edema . Bibasilar opacities may relate to fluid overload , however , superimposed infectious process is difficult to exclude in the appropriate clinical setting , given reported history .
    OUTPUT:
    
Cardiomegaly and pulmonary edema . Bibasilar opacities may relate to fluid overload , however , superimposed infectious process is difficult to exclude in the appropriate clinical setting , given reported history .