Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dual - lead pacemaker / ICD device appears unchanged with leads terminating in the right atrium and ventricle , respectively . The cardiac , mediastinal and hilar contours appear stable . The chest is hyperinflated . There are no pleural effusions or pneumothorax . Streaky opacities at both lung bases suggest dependent atelectasis , greater on the right than left , but appear somewhat striking on the lateral view and compared with the prior lateral scout view .
    OUTPUT:
    
Patchy posterior basilar opacities probably due to atelectasis , although it is difficult to exclude an infectious process .