Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate to severe cardiomegaly is a stable . Enlargement of the pulmonary arteries is again noted . Ill - defined opacity in the right lower lobe could represent atelectasis or pneumonia . There is no pneumothorax or pleural effusion . Sternal wires are intact . There are mild degenerative changes in the thoracic spine . Patient is status post CABG
    OUTPUT:
    
Cardiomegaly . Ill - defined opacities in the right lower lobe could be atelectasis or pneumonia .