Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low suggesting that band like opacity at both lung bases is atelectasis , but that could be due to aspiration , so follow up for pneumonia is indicated . Lower lung volume exaggerates the profusion of interstitial markings and vascularity , but there could be early edema . There is no appreciable pleural effusion . No pneumothorax is seen . Significant atherosclerotic calcifications of the aortic knob are present .
    OUTPUT:
    
Bibasilar atelectasis raises possibility of aspiration . Mild pulmonary edema .