Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Please note that due to an error in PACS , this study is being interpreted on ___ . The heart size is mildly enlarged but unchanged . Left - sided pacemaker device is noted with leads terminating in the right atrium and right ventricle , unchanged . Mediastinal and hilar contours are normal . Pulmonary vascularity is normal . Minimal atelectasis is noted in the left lung base and there is mild elevation of left hemidiaphragm . Right lung is clear . There is no focal consolidation , pleural effusion or pneumothorax .
    OUTPUT:
    
Minimal left basilar atelectasis .