Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size remains unchanged , appearing borderline enlarged . The aortic knob is calcified . There is mild crowding of the bronchovascular structures but no overt pulmonary edema is demonstrated . Patchy opacities are demonstrated in both lung bases , more pronounced in the left , which may reflect areas of aspiration or infection . No pleural effusion or pneumothorax is seen . Remote right - sided rib fracture is noted .
    OUTPUT:
    
Low lung volumes . Patchy bibasilar airspace opacities are concerning for areas of infection or aspiration , more pronounced in the left lung base .