Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower compared to the prior study . This accentuates the size of the cardiac silhouette which is likely at the upper limits of normal . The mediastinal and hilar contours are relatively unchanged . Interstitial opacities bilaterally are primarily within a perihilar and basilar distribution and appear slightly worse when compared to the prior chest radiograph . No pleural effusion or pneumothorax is identified , and no acute osseous abnormality is seen . Pulmonary vascularity is not engorged .
    OUTPUT:
    
Lower lung volumes with slightly increased interstitial opacities within a bibasilar and perihilar distribution , which could reflect worsening chronic interstitial lung disease . A superimposed infectious process can not be completely excluded .