Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and prior CABG surgery . Severe enlargement of the cardiac silhouette is unchanged . An asymmetric opacity in the right lung base is increased from the prior study , concerning for right lower lobe pneumonia . There is no pleural effusion or pneumothorax . The pulmonary vasculature is not engorged and there is no overt pulmonary edema . The mediastinal contours are prominent but unchanged . No acute osseous abnormality is detected .
    OUTPUT:
    
1 . Asymmetric opacity in the right lower lobe could represent pneumonia in the appropriate clinical context . 2 . Severe cardiomegaly without evidence of acute heart failure .