Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and mitral valve replacement . The heart size is normal . Dense coronary calcifications are again seen . Chain sutures within the mid right lung field are overall unchanged ; however , there appears to be subtle increase in hazy opacification overlying the right lower lung . There is also evidence of interstital thickening , secondary to interstitial edema . Calcified pleural plaques are again redemonstrated . There is no large pleural effusion or pneumothorax . No osseous abnormalities are detected .
    OUTPUT:
    
Subtle increase in opacity over the right lower lung field and interstitial thickening may be secondary to pulmonary edema .