Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left chest wall pacemaker is present with leads within the right atrium and right ventricle . Lungs are well - expanded . Opacity projecting over the left lateral chest may represent overlapping soft tissue . Otherwise there is no focal consolidation , pleural effusion or pneumothorax . The cardiomediastinal slight is unchanged . Large hiatal hernia is again re - demonstrated . Old right rib fractures are unchanged .
    OUTPUT:
    
Opacity over the left lateral lower lobe may represent overlying soft tissue but atelectasis or early infection is also possible .