Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are extremely low , limiting evaluation . Prominence of the cardiomediastinal silhouette is likely technique related . There is moderate bibasilar atelectasis . There is no evidence of pneumothorax .
    OUTPUT:
    
Limited exam due to severely low lung volumes . Moderate bibasilar atelectasis . A repeat examination , with an improved inspiratory effort is recommended .