Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy and probably coronary artery bypass graft surgery . The heart is normal in size . The aortic arch is calcified . There is mild perihilar congestion and bilateral pleural effusions , small to moderate on the right and small on the left with associated areas of atelectasis at the lung bases . Mild subpleural scarring is noted at each lung apex .
    OUTPUT:
    
Findings suggest mild vascular congestion and pleural effusions . Prior coronary artery bypass graft surgery .