Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are normal . Pulmonary vasculature is not engorged . As seen on the previous chest radiograph are ill - defined opacities within the left upper lobe and left lung base . The right lung is clear apart from subsegmental atelectasis or scarring at the right lung base . No new focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities . Cholecystectomy clips are seen in the right upper quadrant of the abdomen .
    OUTPUT:
    
Ill - defined opacities within the left upper lobe and left lung base are unchanged from previous radiograph , and likely worse or new compared to the most recent chest CT . This could be due to an infectious etiology or cryptogenic organizing pneumonia , given that ground - glass opacities have been seen on prior chest CTs in a waxing and waning fashion .