Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest was obtained . Right basilar opacity previously noted to represent pleural effusion and atelectasis with the right hemidiaphragm remaining elevated . A lateral view would be helpful for further evaluation . The left lung is clear . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Right base opacity previously seen to represent right pleural effusion and atelectasis has decreased as compared to the prior study ; a lateral view would be helpful for further evaluation .