Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright frontal view of the chest . The patient has had a prior CABG and aortic valve replacement . The lungs are hyperinflated consistent with COPD . The mild cardiomegaly is stable since ___ . The aortic knob is calcified . There is mild pulmonary vascular congestion and mild pulmonary edema . There is a small right pleural effusion that appears unchanged since the prior radiograph performed 8 hours prior . There is no pneumothorax .
    OUTPUT:
    
Mild vascular congestion and mild pulmonary edema . A small right pleural effusion appears similar compared to the prior radiograph performed 8 hours prior .