Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable AP semi-upright view of the chest was obtained . Heart is normal in size and cardiomediastinal contour is unremarkable . Lungs are clear . Right lower rib fractures are better evaluated on the CT scan . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No significant change compared to the most recent study .