Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is accentuated as result , appearing mildly enlarged . Aortic knob remains calcified . The mediastinal and hilar contours are relatively unchanged . There is mild crowding of the bronchovascular structures but no overt pulmonary edema is seen . Patchy bibasilar airspace opacities most likely reflect atelectasis . No pleural effusion or pneumothorax is seen . No acute osseous abnormalities are detected .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis , but infection is not excluded .