Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single AP chest radiograph was obtained . The lungs are well expanded . A right lower lobe opacity is improved compared with ___ . Mild pulmonary pulmonary edema persists , but is improved compared to the prior exam . No definite pleural effusion or pneumothorax . Mild to moderate cardiomegaly is unchanged .
    OUTPUT:
    
Improving right lower lobe opacity , likely representing atelectasis rather than infection . Mild pulmonary edema , also improved , with resolution of the previously noted bilateral pleural effusions .