Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are normal . There is central vascular congestion with minimal interstitial pulmonary edema . Opacity within the right middle lobe has improved since prior study and suggests atelectasis , less likely infection . Trace right pleural effusion . No pneumothorax . Mild cardiomegaly is unchanged . There is mild unfolding of the thoracic aorta with calcification at the aortic knob . Otherwise , mediastinal contours are unremarkable . No compression deformity in the thoracic spine is visualized on the lateral view .
    OUTPUT:
    
1 . Stable mild cardiomegaly with central vascular congestion and mild interstitial pulmonary edema . 2 . Right middle lobe opacity suggests atelectasis , less likely infection .