Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . Lung volumes are slightly low . Mediastinal and hilar contours are within normal limits . There is crowding of bronchovascular structures without pulmonary edema . Patchy opacities in the lung bases likely reflect areas of atelectasis , with no focal consolidation , pleural effusion or pneumothorax identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Low lung volumes with patchy bibasilar atelectasis .