Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device is noted with leads terminating in the right atrium and right ventricle . There is mild enlargement of cardiac silhouette . Mediastinal and hilar contours are unremarkable , and the pulmonary vasculature is not engorged . Streaky opacities are seen within the lung bases bilaterally , which may reflect atelectasis . Infection however is not excluded . Previously noted pulmonary nodules on CT are not well assessed on the current exam . There is no pleural effusion , focal consolidation or pneumothorax . Mild degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
Patchy bibasilar airspace opacities could reflect atelectasis but infection is not excluded .