Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly with tortuosity of the thoracic aorta is unchanged from prior study . Hilar contours are unremarkable . Right lung base atelectasis and small right greater than left pleural effusion is improved compared to prior study . The lungs are hyperinflated with relatively lucent lung fields , compatible with emphysema . Lungs are otherwise clear . There is no pneumothorax .
    OUTPUT:
    
1 . Improving right lung base atelectasis with small bilateral right greater than left effusions . 2 . Severe emphysema .