Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without consolidation or edema . Again , there is a linear opacity in the right lower lung zone , which is similar to the prior exam , and most consistent with atelectasis . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal . There is no pneumomediastinum .
    OUTPUT:
    
No acute cardiopulmonary process ; specifically , normal appearance of the mediastinal contours .