Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . Linear opacities in both lung bases appear unchanged , likely subsegmental atelectasis or scarring . Blunting of the right costophrenic angle appears unchanged . Left basilar density is compatible with prior pleurodesis , better seen on the prior CT . No large pleural effusion or pneumothorax is demonstrated . No acute osseous abnormality is detected .
    OUTPUT:
    
Bibasilar subsegmental atelectasis or scarring . Prior left - sided pleurodesis and chronic blunting of the right costophrenic angle , potentially pleural thickening . No large pleural effusion identified .