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 lowermost sternal wire again shows dishiscences which are unchanged . The cardiac , mediastinal and hilar contours appear stable . A vague opacity obscuring the lingula is not very striking . The lung volumes are low , probably explaining crowding of lung markings at the lung bases . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Vague a lingular opacity although not very striking . If pneumonia is a clinical concern short - term followup PA and later lateral radiographs may be helpful but findings are not highly convincing for pneumonia .