Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: At the left apex , a subtle interface may represent a tiny pneumothorax , although this is not definite . In comparison to the prior radiograph , there has been no change . If further evaluation is necessary , obtain a frontal expiration views . The lungs are clear . There is no pleural effusion . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
If present , tiny left apical pneumothorax has not changed in size . If further evaluation is clinically warranted , obtain a frontal expiration view .