Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , effusion or pneumothorax . There is however linear lucency adjacent to the trachea , particularly on the lateral view and overlying the left hilar region , raising the possibility of pneumomediastinum . There is no subcutaneous gas in the neck or elsewhere . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
No focal consolidation . Possible pneumomediastinum .