Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate well - expanded lungs . Again seen is a focal opacity at the right lower lobe , which represents a combination of a moderate - sized pleural effusion and adjacent atelectasis , and is slightly improved from the prior study dated ___ . There is persistent atelectasis of the right middle lobe , which is seen as far back as ___ . The aorta is tortuous . There is a small left - sided pleural effusion . The cardiomediastinal and hilar contours are unchanged .
    OUTPUT:
    
Moderate - sized pleural effusion with adjacent atelectasis at the right lung base is slightly improved from the prior study .