Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Cardiac , mediastinal and hilar contours are unchanged and unremarkable . There is crowding of bronchovascular structures without overt pulmonary edema . No focal consolidation , pleural effusion or pneumothorax is present . Atelectasis is seen in both lung bases . No acute osseous abnormality is detected .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .