Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unchanged , with the heart size mildly enlarged . Lung volumes are low with linear and streaky opacities in the lung bases , most likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . There is no pulmonary vascular congestion . No acute osseous abnormalities are visualized .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .