Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy and aortic valve replacement . There is also a dual - lead pacemaker / ICD device with leads terminating in the right atrium and ventricle , respectively . The cardiac , mediastinal and hilar contours appear unchanged , including a large hiatal hernia . Aside from streaky atelectasis associated with hernia , the lungs appear clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left basilar opacity , but probably attributable to atelectasis associated with a large hiatal hernia ; no definite interval change .