Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear and the cardiomediastinal silhouette is normal . There is no pleural effusion or pneumothorax . There is no obvious rib fracture . Clavicles are intact .
    OUTPUT:
    
No acute cardiopulmonary process or evidence of rib fracture , however plain radiography is limited in the assessment of subtle rib fractures .