Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated bilaterally with unchanged round atelectasis again seen in the left lower lobe . Otherwise , the lungs are well expanded and clear bilaterally with no pleural effusion or pneumothorax . The cardiomediastinal silhouette is within normal limits with no evidence of pericardial effusions . Pleural surfaces and osseous structures are unremarkable .
    OUTPUT:
    
No evidence of pericardial or pleural effusions . Study is essentially unchanged from prior .