Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and two lateral views of the chest . Although there are persistent diffuse bilateral parenchymal opacities in the mid - to - lower lungs , there has been interval improvement of the appearance of the upper lungs . Cardiomediastinal silhouette is stable . Atherosclerotic calcification is again noted at the arch . No acute osseous abnormality is detected .
    OUTPUT:
    
Mild interval improvement in the bilateral parenchymal opacities , particularly at the lung apices .