Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are compared to previous exam from ___ . There is minimal opacity at the left lung base laterally , which has improved since exam from two days ago and is suggestive of atelectasis . Elsewhere , the lungs are clear . There are small persistent bilateral effusions which have not significantly changed . The cardiomediastinal silhouette is within normal limits . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Small persistent bilateral effusions and left base atelectasis . No confluent consolidation .