Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Cardiomediastinal silhouette and hilar contours are normal . There is trace left base atelectasis . Blunting is seen posteriorly suggesting a small effusion . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
Possible small effusion seen on lateral view only , side indeterminate . Otherwise no acute cardiopulmonary abnormality .