Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires and mediastinal clips again noted . The heart is moderately enlarged . There is a retrocardiac opacity which is concerning for pneumonia in the left lower lobe . Small bilateral pleural effusions are likely present . Left mid lung linear density likely represents atelectasis . Mild hilar congestion is likely present . No pneumothorax . Bony structures are intact . Mediastinal contour is normal .
    OUTPUT:
    
Cardiomegaly , mild central hilar congestion , small bilateral pleural effusions , retrocardiac opacity concerning for pneumonia .