Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation . There is mild bibasilar atelectasis . A subcentimeter nodular opacity seen over the left lung base on radiograph ___ is not visualized . No pleural effusion or pneumothorax is seen . Cardiomediastinal silhouette is unchanged . .
    OUTPUT:
    
No acute cardiopulmonary process .