Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP view of the chest provided . Underlying trauma board is present which somewhat limits the evaluation . The lungs appear clear and well aerated . There is no definite sign of pneumothorax or large effusion . Cardiomediastinal silhouette appears normal . No definite bony abnormalities .
    OUTPUT:
    
No acute abnormalities identified . Please refer to subsequent CT chest for further details .