Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are reduced compared to the previous exam , causing accentuation of the cardiac silhouette size . Heart size is still within normal limits . Aortic knob is calcified . Spiculated right hilar mass appears relatively unchanged compared to the previous exam . There is crowding of the bronchovascular structures as a result of low lung volumes but no overt pulmonary edema is demonstrated . Patchy bibasilar airspace opacities could reflect atelectasis due to low lung volumes , but infection or aspiration can not be completely excluded . Calcified pleural plaque within the left lung base is unchanged as are bullous emphysematous changes in the lung apices . No acute osseous abnormalities present . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Low lung volumes . Bibasilar patchy airspace opacities could reflect atelectasis but aspiration or infection can not be excluded . 2 . Unchanged right hilar mass . 3 . Bullous emphysema .