Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker device is noted with leads terminating in the right atrium and right ventricle . Heart size remains mildly enlarged with a left ventricular predominance . The aorta is unfolded with diffuse atherosclerotic calcifications . Pulmonary vasculature is normal . There is minimal atelectasis within the lung bases . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Minimal bibasilar atelectasis .