Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , limiting evaluation . A linear opacity at the right base is most likely atelectasis . There is no focal airspace consolidation to suggest pneumonia . There is no pulmonary edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Bibasilar atelectasis . No definite evidence of pneumonia .