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 . A dual - lead dual - lead pacemaker / ICD device appears unchanged . The cardiac , mediastinal and hilar contours appear stable . There is again a moderate - sized hiatal hernia . The lung volumes are low . Trace pleural effusions are suspected . Fissures are also mildly thickened , but there is no evidence for parenchymal edema or focal opacification . There is no free air .
    OUTPUT:
    
Trace suspected pleural effusions . No evidence for pneumonia or congestive heart failure .