Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable AP view of the chest provided . Underlying trauma board is in place . The lungs appear clear . No large consolidation or supine evidence for effusion or pneumothorax . The cardiomediastinal silhouette appears stable with atherosclerotic calcifications along the aortic knob .
    OUTPUT:
    
No definite acute bony injury .