Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal portable upright chest radiograph demonstrates stable severe cardiomegaly with increased hazy prominence of the pulmonary vasculature with multifocal opacifications bilaterally , right greater than left . No pleural effusion or pneumothorax is evident . Findings may represent pulmonary edema , though infectious process is not excluded . No pneumothorax evident . Sternotomy sutures are midline . Stable fracture of the first sternotomy suture identified .
    OUTPUT:
    
Stable severe cardiomegaly with background pulmonary edema . Increased interstitial markings at right lung base may represent asymmetric edema versus developing infectious process .