Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged . The aorta is unfolded . Apparent widening of the mediastinum is likely due to low lung volumes as is crowding of the bronchovascular structures . No overt pulmonary edema is present . There is are mild bibasilar opacities , most likely reflecting atelectasis . No pleural effusion or pneumothorax is clearly demonstrated . No acute osseous abnormalities are detected .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis . Infection or aspiration at the lung bases is not completely excluded , and a repeat exam with improved inspiratory effort may be helpful in assessing the lung bases .