Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent increased opacity projecting over the left lung base as well as blunting of the lateral costophrenic angle on the left . Elsewhere , lungs are clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
No significant interval change of left - sided pleural effusion with adjacent atelectasis .