Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable chest radiograph demonstrates well expanded lungs with previously identified linear retrocardiac opacity unchanged and likely atelectasis . No new focal consolidation . No pneumothorax or pleural effusion identified . Redemonstration of mildly dilated or torturous ascending aorta with unchanged mildly enlarged heart .
    OUTPUT:
    
1 . Unchanged linear retrocardiac opacity likely minimal atelectasis . No new focal consolidation . 2 . Stable mild cardiomegaly .