Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate well expanded lungs . Previously identified linear retrocardiac opacity unchanged , likely minimal atelectasis . Mildly dilated or tortuous descending aorta . Pulmonary vasculature otherwise unremarkable . Minimal right pleural effusion best seen on lateral view . Mildly enlarged heart stable since prior examinations . No pneumothorax .
    OUTPUT:
    
1 . Unchanged linear retrocardiac opacity , likely minimal atelectasis . 2 . Stable mild cardiomegaly .