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 likely mildly enlarged but unchanged . The aorta remains tortuous . A moderate - sized hiatal hernia is again demonstrated . There is crowding of the bronchovascular structures with mild pulmonary vascular congestion . Patchy ill - defined opacities within the lung bases could reflect atelectasis though infection or aspiration can not be completely excluded . A trace right pleural effusion may be present . There is no pneumothorax . No acute osseous abnormality is seen .
    OUTPUT:
    
Low lung volumes which limits assessment of the lung bases . Patchy ill - defined opacities in the lung bases may reflect atelectasis though infection or aspiration are also a consideration . Mild pulmonary vascular congestion . Possible trace right pleural effusion .