Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . The heart size is normal . The aorta remains tortuous and diffusely calcified . There is crowding of the bronchovascular structures , and an element of mild pulmonary vascular congestion can not be completely excluded . Streaky opacities in the lung bases are similar compared to the prior study , and likely reflect atelectasis . No pleural effusion or pneumothorax is present , and no focal consolidation is demonstrated . Cholecystectomy clips are seen in the right upper quadrant of the abdomen .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis . Pneumonia in the lung bases , however , can not be completely excluded .