Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are similar . No pulmonary edema is present . Patchy and linear opacities in the lung bases are similar compared to the previous exam and may reflect a combination of chronic interstitial abnormality and atelectasis . No new focal consolidation , pleural effusion or pneumothorax is present . Numerous clips are demonstrated at the gastroesophageal junction . No subdiaphragmatic free air is identified .
    OUTPUT:
    
No subdiaphragmatic free air identified . Patchy and linear bibasilar opacities , not substantially changed from the prior study , and potentially reflect mild chronic interstitial abnormality and atelectasis .