Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . Lungs are well - expanded with incidental note made of an azygos lobe . Increased interstitial markings at the lung periphery bilaterally correlate to subpleural interstitial changes seen on prior CT . The upper abdomen is unremarkable in appearance .
    OUTPUT:
    
Diffuse chronic interstitial changes , as seen on prior chest CT . No evidence for pleural effusion or pneumonia . No definite evidence of metastatic disease by chest radiograph , although chest CT is more sensitive for detection of metastatic disease .