Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged . Mediastinal contours are somewhat widened , but this is likely due to low lung volumes and the presence of mediastinal fat . There is crowding of the bronchovascular structures . No overt pulmonary edema is noted . Minimal bibasilar streaky airspace opacities likely reflect atelectasis . No pneumothorax or pleural effusion is demonstrated . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .