Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes with bibasilar atelectasis are chronic . There is no new consolidation . There is no pulmonary edema . Mildly enlarged cardiac and mediastinal contour is stable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
The exam is unchanged since ___ . Low lung volumes with bibasilar atelectasis seem to be chronic . There is no evidence of pneumonia .