Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar opacities may represent atelectasis , but aspiration or infection should be considered in the appropriate clinical setting . Biapical pleural - parenchymal scarring . Mild pulmonary vascular congestion , without overt pulmonary edema . Severe background emphysema . No pleural effusion or pneumothorax . Cardiomediastinal contours are normal . No acute osseous abnormalities identified . No subdiaphragmatic free air .
    OUTPUT:
    
1 . Bibasilar opacities may represent atelectasis , but aspiration or infection should be considered in the appropriate clinical setting . 2 . Mild pulmonary vascular congestion .