Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right basilar atelectasis and pleural effusion are similar in appearance compared to the prior study . The left lung is essentially clear , with only trace retrocardiac opacity remaining , likely atelectasis . There is no pulmonary edema , pneumonia , or pneumothorax . The heart is mildly enlarged , and surgical clips and prosthetic aortic valve are unchanged .
    OUTPUT:
    
Stable small right pleural effusion and right basilar atelectasis . No pneumonia or pulmonary edema .