Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . This accentuates the size of the cardiac silhouette which is top normal . Mediastinal and hilar contours are unremarkable . There is crowding of the bronchovascular structures but no overt pulmonary edema is present . Hazy and patchy opacities in the retrocardiac region and right lung base may reflect areas of atelectasis though aspiration or infection can not be excluded . There are probable trace bilateral pleural effusions . No pneumothorax is demonstrated . There are no acute osseous abnormalities seen .
    OUTPUT:
    
Low lung volumes . Patchy bibasilar airspace opacities are nonspecific but could reflect areas of atelectasis , aspiration or infection . Probable trace bilateral pleural effusions .