Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are again noted . Bibasilar opacities are noted , potentially atelectasis similar to prior . There is persistent blunting of the posterior costophrenic angles suggesting small effusions . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Small bilateral pleural effusions . Probable bibasilar atelectasis given low lung volumes noting infection can not be entirely excluded . No significant change since recent exam .