Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume without focal consolidation , pleural effusion or pneumothorax . Micronodular scarring is unchanged in the right upper lung . Old left - sided rib fractures are noted . The heart is normal in size , normal cardiomediastinal contours .
    OUTPUT:
    
No acute intrathoracic process .