Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . Aortic knob calcifications are present . The mediastinal contours are unremarkable . There is mild upper zone vascular redistribution suggestive of mild pulmonary vascular congestion , but no overt pulmonary edema . Lungs are hyperinflated . Streaky opacities are seen in the lung bases likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . There are mild degenerative changes noted in the thoracic spine . No acute osseous abnormalities are visualized .
    OUTPUT:
    
Mild bibasilar atelectasis and mild pulmonary vascular congestion .