Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lung volumes are low though lungs appear clear . Perihilar opacities are stable and likely reflect post XRT changes . Cardiomediastinal silhouette is unchanged . No pneumothorax or effusion . Bony structures are intact .
    OUTPUT:
    
No acute intrathoracic process .