Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacer device is noted with leads terminating in the right atrium and right ventricle , unchanged . Mild enlargement of the cardiac silhouette is demonstrated . The aorta is diffusely calcified and tortuous . Lungs are hyperinflated . Hilar contours are similar . No pulmonary vascular engorgement is seen . Tubular opacity within the right upper lobe is unchanged , characterized on the prior CT as an area of mucous plugging . Streaky atelectasis is noted in the lung bases without focal consolidation . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
Streaky bibasilar opacities compatible with atelectasis . Unchanged tubular opacity in the right upper lobe , previously characterized on CT as an area of mucous plugging .